Symfony2 Issue with Forms

<?php

namespace Vendor\AppBundle\Controller;

use Sensio\Bundle\FrameworkExtraBundle\Configuration\Route;
use Sensio\Bundle\FrameworkExtraBundle\Configuration\Template;
use Vendor\AppBundle\Chat\ChatRequest;
use Vendor\AppBundle\Document\CannedMessage;
use Vendor\AppBundle\Document\Operator;
use Vendor\AppBundle\Document\Session;
use Vendor\AppBundle\Document\User;
use Vendor\AppBundle\Document\Visit;
use Vendor\AppBundle\Document\Visitor;
use Vendor\AppBundle\Form\ChatRequestType;
use Symfony\Bundle\FrameworkBundle\Controller\Controller;
use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
use Symfony\Component\HttpFoundation\RedirectResponse;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\HttpFoundation\Session\Session as SessionStorage;
use Swift_Message;

    /**
     * @Route("/", name="app_homepage")
     * @throws \Symfony\Component\HttpKernel\Exception\NotFoundHttpException
     * @return \Symfony\Bundle\FrameworkBundle\Controller\Response|\Symfony\Component\HttpFoundation\RedirectResponse
     */
    public function indexAction()
    {
        $visitor = $this->getVisitorByKey();
        $session = new SessionStorage();
        if ($this->getOperator()) {
            throw new NotFoundHttpException('No app found.');
        }

        $appRequest = new appRequest();

        /* @var $form \Symfony\Component\Form\Form */
        $form = $this->createForm(new appRequestType(), $appRequest);
        $response = new Response();

        if ('POST' == $this->getRequest()->getMethod()) {
            $form->bindRequest($this->getRequest());
            $appRequest = $form->getData();

            if ($form->isValid()) {
                $dm = $this->getDocumentManager();

                $visitor->setEmail($appRequest->getEmail());
                $visitor->setName($appRequest->getName());
                $dm->persist($visitor);

                $visit = $this->getVisitByKey($visitor);

                $appSession = Session::create($visit, $appRequest->getQuestion(), Session::STATUS_WAITING);
                $dm->persist($appSession);
                $dm->flush();

                $session->getBag('appsession')->set('appsession', $appSession->getId());
                $this->cacheUserForSession($visitor, $appSession);

                return $this->redirect($this->generateUrl('sglc_app_load', array('id' => $appSession->getId())));
            } else {
                $response->setStatusCode(403);
            }
        }

        return $this->render('VendorAppBundle:app:index.html.twig', array(
            'visitor' => $visitor,
            'errorMsg' => $session->getFlashBag()->get('errorMsg', array()),
            'form' => $form->createView()
        ), $response);
    }