Drupal 7.22 and Templating
You need to use the non-aliased path for the template name.

For example if you are dealing with node 1 (node ID = 1) try naming the file page--node--1.tpl.php and clearing the cache again.

For more info see: https://drupal.org/node/1089656#page-suggestion

If you don't know what the node id is, go to the node edit page and it will be in the url /node/NODEID/edit.