private function traitGuestInfo(Response $response, User $user)
 {
     if ($guests = $response->getGuests()) {
         foreach ($guests as &$guest) {
             if ($user->getBlacklist()->isBanned($guest[PropertiesDAO::USER_ID])) {
                 $guest += ['banned' => $user->getId()];
             }
             if ($note = $user->getUserNotes()->getNote($guest[PropertiesDAO::USER_ID])) {
                 $guest += ['note' => $note];
             }
         }
         $response->setGuestsRaw($guests);
     }
 }