How can I list all pages following one template on WordPress?

I've trying to write an if statement (in WordPress) that says.. If there are pages following this template, list them all here (title only)..

It's for a "services" section on a website following the services template, i want to do this so if the client adds more services at a later date they will automatically show in the listing..

So far i have:

<ul> <?php if ( is_page_template( 'template-services.php' ) ) : ?> <li><?php wp_title(); ?></li> <?php endif ?> </ul>

Help! Thank you in advance!