Don't worry, your guest will get the refund due. It might take 24 hours or more. I have been doing this for a year now, more than 70 bookings, and people's plans change. The guest always gets the money back. It is not always good for the host. Check your airbnb cancellation policy. I have ''moderate'' but you can decide to choose ''strict''. When you get a request, before you accept it, take the time to ask a few questions so you know you and the guest understand each other. Don't do ''instant book'', not until you know what you are doing. Good luck, Theresa.