You can enable or disable Book Now button in single trip page as per your requirement. If you want to enable/disable Book Now button in single trip page then you can fulfill your requirement by going to Admin Panel > WP Travel > Settings > Tabs

Also, if the global tabs layout option has been disabled and the individual trip tabs setting has been used then you can Enable/Disable Book Now button by going to Admin Panel > Trips > Individual Trip(edited) > Tabs

If you have any confusion then please post them in our official support forum.