Not extending my layout

<?php
class UserController extends ControllerBase
{
    public function initialize(){
        Tag::setTitle('User');
        $this->view->setLayout('user');
        parent::initialize();
    }
    public function indexAction(){
        echo"Hello user";
    }
    public function goodbyeAction(){
        echo"goodbye";
    }
}

when I execute indexaction it uses my user layout which displays the code on my browser

<section class="container">
        <div class="row">
                    <div class="col-md-12"> 

                        <p>hello user  </p>

                 </div>
         </div>
</section>

when I execute goodbyeaction it just simply shows "goodbye" when I view source. What I want is it also uses the user layout just like what the indexaction does.