@Julia1
You do not have to accept/decline within 24 hours.
You merely need to have done something, such as send a message answering a question.
If you send questions and dont get answers for example,then dont accept or decline...wait for the guest to do it, when they realise that they dont need the request open any more.
Yesterday I received a booking and havent accepted or declined. I answer the guest question and am waiting for furthe contact as the guest has no reviews and I want to see if I can establish some idea about them.
If I dont hear anything more I will just leave it....my acceptance rate is only negatively effected it I actually press the decline button, not if the guest cancels their request.