By Template:
$pages_using_template = get_pages(array(
'meta_key' => '_wp_page_template',
'meta_value' => 'template-press-release-list.php',
'post_status' => 'publish',
'post_type' => 'page',
'hierarchical' => 0 //because page looking for could have a parent - without this only gets top level pages.
));
Check if got anything and use it from query above:
if($pages_using_template && count($pages_using_template) > 0) :
$page = $pages_using_template[0];
esc_url(get_the_permalink($page));
endif; ?>
By Path:
$page = get_page_by_path('parent-page/sub-page');