Guess leaving keys in unlocked car.

What is it with guest who think it’s ok to leave your keys in an unlocked vehicle without even notifying you. I literally hand the keys to every guest. We as host have to wait two hours for the guest to arrive yet they feel that they can’t wait a few minutes. I had one guest ask me multiple times what to do with the key after she extended once and I told her I would be there to receive the key. I wonder if they would leave their own keys unattended in a vehicle.