/**
  * @param $lectureId
  * @Method('POST')
  * @Route('lectures/{integer $lectureId}/cancelinvitation/{integer $speakerId}')
  * @param $speakerId
  */
 public function cancelInvitation(integer $lectureId, integer $speakerId)
 {
     $service = new LecturesService($this->dbContext);
     $result = $service->removeSpeaker($lectureId, $speakerId);
     $this->processResponse($result);
     $this->redirect('conferences', 'own');
 }