CakePHP 3 contact controller

ContactController.php

<?php

namespace App\Controller;

use App\Controller\AppController;
use App\Form\ContactForm;

class ContactController extends AppController
{
    public function index()
    {
        $contact = new ContactForm();
        if ($this->request->is('post')) {
//            $isValid = $form->validate($this->request->data);
            
            if ($contact->execute($this->request->data)) {
                $this->Flash->success('We will get back to you soon.');
            } else {
                $this->Flash->error('There was a problem submitting your form.');
            }
        }
        $this->set('contact', $contact);
    }
}