@Samantha1596
You would have to decline the booking request if the guest won't sign the waiver.
Just to note....If you do some research about liability waivers, many times they won't stand up in court if there is proven negligence such as faulty or broken equipment, missing safety equipment, etc. An attorney could better advise you on that. I doubt Airbnb will get involved in this...it is between you and your guests.