In Magento 2 Advanced Booking and Reservation module, the customer can ask queries related to the Booking products. Click on the “Ask a Question” tab to ask your queries as per the below image.
For this, the admin can revert to the customer queries as per the below image.
On the frontend, the admin can view the questions along with the Write an Answer button. The admin will click on this button and write the answer and then submit it.