diff --git a/booking.variety_form.inc b/booking.variety_form.inc
index 1015aab..89963bf 100644
--- a/booking.variety_form.inc
+++ b/booking.variety_form.inc
@@ -124,10 +124,34 @@ function _booking_get_variety_timeslot_options($timeslot_id) {
  * Callback function to rebuild the variety session fieldset
  */
 function booking_variety_session_form_callback($form, &$form_state) {
-  $form_state['rebuild'] = TRUE;
+  global $event;
+  $data = $form_state['input'];
+
   //$form['form']['variety-sessions']['booking_feedback_wrapper']['#markup'] = '<div id="booking_feedback_wrapper">Test</div>';
   //return $form['form']['variety-sessions'];
-  $form['form']['identity']['booking_feedback_wrapper']['#markup'] = '<div id="booking_feedback_wrapper">Test</div>';
+
+  // Perform lookup on person to make sure it matches someone attending the current event
+  $db_and = db_and();
+  $db_and->condition('p.booking_eventid', $event->eid, '=');
+  $db_and->condition('p.booking_status', 1, '=');
+  $db_and->condition('p.nid', $data['booking_nid'], '=');
+  $db_and->condition('p.booking_lastname', $data['booking_lastname'], '=');
+
+  $query = db_select('booking_person', 'p');
+  $query->condition($db_and)
+    ->fields('p');
+  $person = $query->execute()
+    ->fetchObject();  
+
+  // Update feedback based on query result
+  if (! $person) {
+    $form['form']['identity']['booking_feedback_wrapper']['#markup'] = '<div id="booking_feedback_wrapper">Identity not found.</div>';
+  }
+  else {
+    $form['form']['identity']['booking_feedback_wrapper']['#markup'] = '<div id="booking_feedback_wrapper">Identity matched.</div>';
+  }
+
+  $form_state['rebuild'] = TRUE;
   return $form['form'];
 }