If you want to get the Controller's name from services.php, for example, you can use Routes like this:
$di = new Phalcon\Di\FactoryDefault();
$di->set("getControllerAndActionNames", function () use ($di) {
    $router = $di->getShared('router');
    $ControllerName = $router->getControllerName();
    $ActionName = router->getActionName();
    return $ControllerName.'/'.$ActionName; // This returns "registration/index" for RegistrationController and indexAction
});
And the next you can use redirect (If I understood you correctly, else it's just an example):
// ...
class RegistrationController extends Controller
{
    public function indexAction()
    {
        $this->response->redirect($this->getControllerAndActionNames);
        // If I'm right, it will work like this: $this->response->redirect('registration/index');
    }
}
//...