Sequential Elasticsearch Dates

I am creating a hotel reservation system using Elasticsearch and trying to find a way to return hotels with a variable number of available dates (e.g. 7 days) in a date range

Currently, I store dates and prices as a children's document in the hotel, but I don’t know how to search or if it is possible even with my current setting?

Edit: Added Mappings

Hotel mapping

{
  "hotel":{
    "properties":{
      "city":{
        "type":"string"
      },
      "hotelid":{
        "type":"long"
      },
      "lat":{
        "type":"double"
      },
      "long":{
        "type":"double"
      },
      "name":{
        "type":"multi_field",
        "fields":{
          "name":{
            "type":"string"
          },
          "name.exact":{
            "type":"string",
            "index":"not_analyzed",
            "omit_norms":true,
            "index_options":"docs",
            "include_in_all":false
          }
        }
      },
      "star":{
        "type":"double"
      }
    }
  }
}

Date display

{
    "dates": {
        "_parent": {
            "type": "hotel"
        },
        "_routing": {
            "required": true
        },
        "properties": {
            "date": {
                "type": "date",
                "format": "dateOptionalTime"
            },
            "price": {
                "type": "double"
            }
        }
    }
}

I am currently using a date range to select the available dates, and then a field query to match the city - the rest of the fields will be used later