Custom post type query string

I have followed the WordPress tutorial for this, but I can’t get it to work.
http://codex.wordpress.org/Rewrite_API/add_rewrite_rule

What I have now:

http://domain.com/timezone?country=netherlands&city=amsterdam

What I want to achieve

http://domain.com/timezone/netherlands/amsterdam

When I go to that URL now I get redirected back to http://domain.com/timezone

I added this code to the functions.php

function custom_rewrite_tag() {
  add_rewrite_tag('%country%', '([^&]+)');
  add_rewrite_tag('%city%', '([^&]+)');
}
add_action('init', 'custom_rewrite_tag', 10, 0);


function custom_rewrite_rule() {
    add_rewrite_rule('timezone/([^/]*)/([^/]*)','index.php?page_id=4&country=$matches[1]&city=$matches[2]','top');
  }
  add_action('init', 'custom_rewrite_rule', 10, 0);
?>

and this code to my custom template

global $wp_query;
    echo 'country : ' . $wp_query->query_vars['country'];
    echo '<br />';
    echo 'city : ' . $wp_query->query_vars['city'];
    ?>

Am I missing something?
Can someone please help?????