CakePHP 3-Step Registration

I am trying to create a registration page with three steps using cakePHP. The first step is fine, it inserts the data in db, but the second step does not work. Can anyone help?

Here is my controller code:

<?php

App::uses('Controller', 'Controller');

class UsersController extends AppController {

public $name = 'Users';

public function beforeFilter(){
    parent::beforeFilter();
    $this->Auth->allow('signup');
}

public function login(){
    if($this->request->is('post')){
        if($this->Auth->login()){
            $this->redirect($this->Auth->redirect());   
        } else {
            $this->Session->setFlash('Invalid username or password!', 'default', array('class' => 'errormsg'));
        }
    }
}
public function logout(){
    $this->redirect($this->Auth->logout());
}
// SIGN UP ACTIONS
public function signup($step = null){
    // SET STEP VARIABLE
    $this->set('s', $step);
    // STEP 1 - REGISTER
    if(empty($step)){
        if ($this->request->is('post')) {
            if ($this->User->save($this->request->data)) {
                $this->Session->write('regUser', $this->request->data['User']['email']);
                // $this->Session->setFlash('The user has been saved, please enter other information!',
                //                          'default', array('class' => 'okormsg'));
                $regUser = $this->User->find(   'first', array('conditions' => array(
                                                'User.username' => $this->Session->read('regUser'))));
                $id = $regUser['User']['id'];

                $this->Session->write('regUserId', $id);

                $this->redirect(array('personal-info'));
            } else {
                $this->Session->setFlash(   'There was an error, please check the fields bellow!',
                                            'default', array('class' => 'errormsg'));
            }
        }
    // STEP 2 - PERSONAL INFORMATION
    } elseif($step == 'personal-info') {
        if ($this->request->is('post')) {
            $id = $this->Session->read('regUserId');
            $this->User->id = $id;

            if ($this->User->save($this->request->data)) {
                $this->Session->setFlash('The user has been saved');
                $this->redirect(array('complete'));
            } else {
                $this->Session->setFlash('User could not be saved. Please, try again.');
            }
        }
    // STEP 3 - COMPLETE REGISTRATION
    } elseif($step == 'complete') {

    }
}
}

?>

Here is the model:

<?php

class User extends AppModel {

public $validate = array (
    'name'=>array(
        'Please enter your name!'=>array(
            'rule'=>'notEmpty',
            'message'=>'Please enter your name!'
        )
    ),
    'surname'=>array(
        'Please enter your surname!'=>array(
            'rule'=>'notEmpty',
            'message'=>'Please enter your surname!'
        )
    ),
    'email'=>array(
        'Valid email'=>array(
            'rule'=>array('email'),
            'message'=>'Please enter a valid Email address!'
        ),
        'Already exists'=>array(
            'rule'=>'isUnique',
            'message'=>'This Email is already registered in our database!'
        )
    ),
    'password'=>array(
        'Not empty'=>array(
            'rule'=>'notEmpty',
            'message'=>'Please enter your password!'
        ),
        'Match password'=>array(
            'rule'=>'matchPasswords',
            'message'=>'Your passwords do not match!'
        )
    ),
    'password_confirm'=>array(
        'Not empty'=>array(
            'rule'=>'notEmpty',
            'message'=>'Please confirm your password!'
        )
    ),
    'terms'=>array(
        'Agree'=>array(
            'rule'=>'notEmpty',
            'required'=>true,
            'message'=>'You must agree to Terms and conditions!'
        )
    )
);

public function matchPasswords($data){
    if ($data['password'] == $this->data['User']['password_confirm']){
        return true;
    } else {
        $this->invalidate('password_confirm', 'Your passwords do not match!');
        return false;
    }
}
public function beforeSave(){
    if(!empty($this->data['User']['password'])) {
        $this->data['User']['password'] = AuthComponent::password($this->data['User']['password']);
    }
    if (empty($this->data['User']['username'])) {
        $this->data['User']['username'] = $this->data['User']['email'];
    }
    return true;
}
}

?>

And here is the view for signup.ctp

<!--  SIGN UP STEPS  -->
<!--  SIGN UP - 1 (REGISTER)  -->
<?php if(empty($s)): ?>
<div  id="register" class="container padded">
<div id="register">
        <div class="paginate active">Register</div>
        <div class="paginate">Personal Information</div>
        <div class="paginate">Complete Registration</div>
        <h1>User Registration</h1>
        <p>Welcome to user registration! You can sign up yourself and start improving your business. User registration is FREE and once you register yourself you can select apropiate business package for your company and start advertising.<br />
        <span style="color:#900">All field are required!</span></p>
    <?php
        echo $this->Form->create();
        echo $this->Form->input('name');
        echo $this->Form->input('surname');
        echo $this->Form->input('email');
        echo $this->Form->input('password');
        echo $this->Form->input('password_confirm', array('label'=>'Password Confirmation','type'=>'password'));
        echo $this->Form->input('terms', array('label'=>false, 'type'=>'checkbox'));
        ?> I accept <a href="#" class="link">Terms Of Use</a> <?
        echo $this->Form->end('Continue Registration');
    ?>
</div>
</div>
<!--  SIGN UP - 2 (PERSONAL INFO)  -->
<?php elseif($s == 'personal-info'): ?>
<div  id="register" class="container padded">
<div id="register">
        <div class="paginate">Register</div>
        <div class="paginate active">Personal Information</div>
        <div class="paginate">Complete Registration</div>
        <h1>User Registration</h1>
        <p>Welcome to user registration! You can sign up yourself and start improving your business. User registration is FREE and once you register yourself you can select apropiate business package for your company and start advertising.<br />
        <span style="color:#900">All field are required!</span></p>
    <?php
        echo $this->Form->create();
        echo $this->Form->input('phone');
        echo $this->Form->input('address');
        echo $this->Form->input('city');
        echo $this->Form->input('ptt', array('label'=>'Postal Code'));
        echo $this->Form->input('state');
        echo $this->Form->input('country');
        echo $this->Form->end('Complete Registration');
    ?>
</div>
</div>
<!--  SIGN UP - 3 (COMPLETE)  -->
<?php elseif($s == 'complete'): ?>
<div  id="register" class="container padded">
<div id="register">
        <div class="paginate">Register</div>
        <div class="paginate">Personal Information</div>
        <div class="paginate active">Complete Registration</div>
        <h1>User Registration</h1>
        <p>Welcome to user registration! You can sign up yourself and start improving your business. User registration is FREE and once you register yourself you can select apropiate business package for your company and start advertising.<br />
        <span style="color:#900">All field are required!</span></p>
</div>
</div>
<? else: ?>
<div  id="register" class="container padded">
<div id="register">
    Unknown page!
</div>
</div>
<? endif; ?>

So, as I said in the first step, everything is fine, it saves the user in the database, but in the second step I would like to add more information, and when I send it, a Session flash message will be displayed in which the user cannot be saved, so that means that the second user information is not stored in the database.

Please, help!