/**
 * Modify the 'no shipping available' message
 */

add_filter('woocommerce_no_shipping_available_html', 'cc_custom_no_shipping_message');
add_filter('woocommerce_cart_no_shipping_available_html', 'cc_custom_no_shipping_message');

function cc_custom_no_shipping_message($message) {

  return __('We are not able to find a shipping option for your location - please <a href="/contact-us/">contact us</a>');

}