@Mary-Ann162
I suppose you could change your cancellation policy (if you are request to book). Have the guest book under the changed policy. Then after the booking, go back in and change the policy back to what you use now. That should work?
Of course, don't accept any other bookings until you change the policy back. Test it out and see what happens? Change the policy. Try to book as a guest and see what it shows? Then change it back and see if it reverts to your original policy?