You should read the page about Drupal 7 Template suggestions - you would see that the proper template suggestions for Drupal 7 nodes are :
I'm unsure from your question whether you want a template for a particular node (in which case you should use the node id, not the node title -
node--NODEID.tpl.php) or for all nodes of your content type "our locations" (in which case you want to use the second form, which depends on the node type, not the node title,
Note that NODETYPE is your content type's machine name - on your site you will see this next to the content type name when you go to "admin/structure/types", and that hyphens should be replaced by underscores. So if your content type machine name was
our-locations, the template file you want is
Finally remember that once you've added the new template file, you must clear your cache before it gets noticed. You can do this on the performance page on your site at "admin/config/development/performance".