First of all thank you very much for trying out the WP Travel plugin and also would like to thank you for the appreciations.
You can definitely redirect to a new page submitting the Booking form and for this, you have to update your plugin to the recent version i.e. version 1.0.6 which has been released just now and then use the filter to change the URL.
For this, you have to create the child theme.
You can even create the child theme using the plugin given below: