This is the third menu item that appears under WP Travel option.
To enable the enquiry feature you have to enable this by going to Admin Panel > WP Travel > Settings > Misc. Options.

The Enquiries section under the Coupons section in the dashboard menu list all the enquiries that are made from the front-end Trip Inquiry section.

The Admin will be able to edit the content of each individual enquiry by going to individual enquiry edit screen.
Enquiry Detail:

Enquiry Template:
You can even manage the template of the enquiry from WP Travel > Settings > Emails > Enquiry Email Template.

Front-end:
