From the WP Travel version 4.3.2, we have removed the cart page. Since we already have the mini cart page in the checkout page for updating the min, max pax so we have removed the cart page as of now.
However, if you want to have the cart page as before ever after updating to this version then we do have the filter which you can use to get the cart page back.
remove_filter( 'wp_travel_filter_is_enabled_cart_page', 'wp_travel_enable_cart_page', 10, 2 );
Add this filter in your child theme functions.php file.
For detail information regarding how to create a child theme, please refer to our Knowledgebase.
Further, if you have any queries, please submit them to our Contact page.