Warning for potential duplicate reservation

While creating a new room reservation, the system will check if a reservation already exists based on the same GUEST last name, arrival date and departure date. This check will occur when selecting the Create Reservation button. A pop-up message will appear should a potential duplicate reservation be detected:

Yes: we proceed in creating the reservation.
No: we stay on this screen, and you can either abort/remove the reservation.

This check will only work on manually created reservations.