Level 53
If this is inside a routes/web.php route (routes/api.php does not handle sessions) this should be working.
As long as you return something in the method that sets the session value, if it does an exit; or die or anything else, the session wont be set.
$hotelSessionId = 4;
Session::put('hotelSessionId', $hotelSessionId);
$hotelSessionTest = Session::get('hotelSessionId');
dd($hotelSessionTest);