When the entered address doesn’t match any shipping methods, the cart summary shows an abbreviated message indicating there are no shipping methods available:
You can change the ‘No shipping methods available’ in the cart totals area of checkout with this filter:
cfw_shipping_total_not_available_text
Example of how to use the filter:
You can add this snippet to WP Admin > CheckoutWC > Advanced > Scripts > PHP Snippets and adjust the wording to whatever you prefer.