Laravel AJAX form (receiving data concern) - php

Question

I have an issue recieving the data from a form which was modified with AJAX.
I have 2 fields: Cinema and Session.
The Session field updates automatically based on which cinema you have chosen. However, when I try to get the session field's value in my controller, it returns as "" (blank) where-as I want it to return what is actually displayed in the drop down box in the form.
Code:
Script:
<script>
$('#cinema').on('change', function(e){
console.log(e)
var cinema_id = e.target.value;
//ajax
$.get('{{ url('/ajax-subcat') }}?cinema_id=' + cinema_id, function(data){
//success data
console.log(data)
$('#sesh').empty();
$.each(data, function(index, subcatObj){
$('#sesh').append('<option value="'+subcatObj.id+'">'+subcatObj.session_time+'</option>');;
});
});
});
</script>
Controller:
public function cart()
{
$formData = array(
'cinema' => Input::get('cinema'),
'sesh' => Input::get('sesh'),
'ticketType' => Input::get('ticketType'),
'count' => Input::get('count')
);
$cinemaDetails = Cinema::find($formData['cinema']);
$session = Session::find($formData['sesh']);
return view('movies/ticketpage/cart')
->with('formData', $formData)
->with('cinemaDetails', $cinemaDetails)
->with('session', $session);
}
View/Blade file:
<div class="container">
<div class="row">
<div class="col-sm-4">
<h2>{{$movie->title}}</h2>
<img src="/WDAAssign2/Assign2-A/{{ $movie->image }}" height="200" width="150">
<p>{{ $movie->description }}</p>
</div>
<div class="col-sm-4">
<h2>Purchase tickets!</h2>
{!! Form::open(array('action'=>'MoviePageController#cart', 'files'=>true)) !!}
<label>Select a Cinema:</label><br>
<select id = "cinema" name = "cinema">
#foreach ($cinemas as $cinema)
<option value="{{$cinema->id}}">{{$cinema->name}}</option>
#endforeach
</select>
<br>
<label>Select a session:</label>
<br>
<select id = "sesh" name = "sesh">
<option value=""></option>
</select>
<br>
<label>Type of ticket:</label>
<br>
<select id= ="ticketType">
<option value="adult">Adult</option>
<option value="concession">Concession</option>
<option value="children">Children</option>
</select>
<br>
<label>Number of tickets:</label><br>
<select id = "count" name ="count">
#for ($i = 1; $i < 10; $i++)
<option value="{{$i}}">{{$i}}</option>
#endfor
</select>
<br><br>
<input type="submit" value="Submit">
{!!Form::close()!!}
</div>
</div>
</div>
Routes:
Route::post('/movie/ticketpage/cart', 'MoviePageController#cart');