/**
  * Bootstrap any application services.
  *
  * @return void
  */
 public function boot()
 {
     Validator::extend('booking_overlap', function ($attribute, $value, $parameters) {
         $input = \Input::all();
         if (empty($input['from']) || empty($input['to'])) {
             return true;
         }
         $from = Carbon::createFromFormat('d-m-Y', $input['from']);
         $to = Carbon::createFromFormat('d-m-Y', $input['to']);
         $booking = new Booking();
         $overlapping = $booking->overlappingAccepted($from, $to);
         return !$overlapping;
     });
 }