I have a 4-night award stay booked at Conrad Koh Samui around Christmas and would like to extend it to a 5 night stay on the front or back end of my current stay. However there is a 4 night minimum required during this time so I can't seem to find out if the individual night I need is available during that time. I can only search in 4-night windows and if any one of those nights has no availability it shows as not available, even though the night I want might be available. Is there any way to check this online without calling HHonors every day?