view criteria help

I can't figure out the logic to create a view that would show me records that have an ArrivalDate and a DepartureDate that occur on the same date. I need to be able to show Units that where the Guest will depart and another guest will arrive on the same date to the same unit so I can mark them with priority.

Example Fieldnames: | ArrivalDate | DepartureDate | UnitNumber| | GuestName

Thank very much.