Last May made a ressie at HHI for April 22-27. Now work conflicts have come up and we may have to cancel. The points are from my Sept 2017 use year so would expire August 31st, 2018. What can I do with these points if they are returned to my current use year? Can I bank them or do they need to be used by August 31st? In 25 years have never been in this position before!! Thanks for any and all advice !