Guests often consider extending their stays, especially if nearby dates are open. This feature would automatically detect when the check-in day minus one or the check-out day plus one is available, and then send a customizable message encouraging guests to book those dates.

Example Use Case:

A guest books June 10–12.

The nights of June 9 and June 13 are unbooked.

The system automatically sends:

“Hi [Guest Name], the night before and after your stay are still available if you’d like to extend your visit. Let us know if you’re interested!”