The problem is that if the guest changes the reservation to arrive later the price actually rises considerably even though he would be staying for a shorter period. I'm not exactly sure why there is such a big difference.
It doesnt make sense for my guest to change the reservation if he is going to pay more but that means that I can not free up the days on my calendar. And, if I can't free up the dates and re-rent them I can't give the refund that I wanted to give due to the circumstances.
It seems complicated to me so I'm just going to leave it as is and my guest misses out on a partial refund.
I appreciate everyone's help.
Kenny Mackinnon