Hello, I have a a potential booking for a guest for over 28 days. Due to covid travel restrictions he may need to cancel or postpone nearer the time. I'm happy with this and I have a flexible cancellation policy but as its over 28 days it seems I cannot cancel without the guest being charged. Is there a way to override this, or if guest cancels can I choose to give a full refund? Will I still be charged air bnb fees if I do a full refund?