Megento 2 issue sending email from module

<?php  namespace Sixwebsoft\StockRequest\Controller\Index;  use Braintree\Exception; use Magento\Framework\Mail\Template\TransportBuilder;  class Booking extends \Magento\Framework\App\Action\Action {    protected $  resultPageFactory;     protected $  transportBuilder;      public function __construct(         \Magento\Framework\App\Action\Context $  context,         \Magento\Framework\View\Result\PageFactory $  resultPageFactory,         TransportBuilder $  transportBuilder     ) {         $  this->resultPageFactory = $  resultPageFactory;         $  this->transportBuilder = $  transportBuilder;         parent::__construct($  context);     }      public function execute()     {         $  post = $  this->getRequest()->getPostValue();         if (!empty($  post)) {             $  customer_email = $  this->getRequest()->getPost('email');             $  sender_fullname = $  this->getRequest()->getPost('firstname') . ' ' . $  this->getRequest()->getPost('lastname');              $  senderInfo = [                 'name' => 'admin',                 'email' => 'rakesh.jesadiya@krishtechnolabs.com',             ];             $  storeScope = \Magento\Store\Model\ScopeInterface::SCOPE_STORE;             $  transport = $  this->transportBuilder                 ->setTemplateIdentifier('contact_form')                 ->setTemplateOptions(                     [                         'area' => \Magento\Framework\App\Area::AREA_FRONTEND,                         'store' => \Magento\Store\Model\Store::DEFAULT_STORE_ID,                     ]                 )->setTemplateVars(['data' => 'nonprende'])                 ->setFrom($  senderInfo)                 ->addTo('a.giorgini@hoopcommunication.it')                 ->getTransport();             $  transport->sendMessage();         }         return $  this->resultPageFactory->create();     }   }