fix

booking.js

@@ -2,6 +2,6 @@
  * Special Effects AJAX framework command.
  */
 Drupal.ajax.prototype.commands.bookingEmailIDs =  function(ajax, response, status) {
-  var initValues = $('input:hidden#booking_email_default_ids').val());
+  var initValues = $('input:hidden#booking_email_default_ids').val();
   alert(initValues)  ; // this will be executed after the ajax call
 }