If you banked points issued in June 07 to your June 08 use year they must and can only be used for a trip that occurs betweeen June 1, 2008 and May 31, 2009 (which is your 2008 use year). You can of course call to reserve trip 11 months in advance at your home resort (e.g., you can call now to reserve time in Sep 08 using those banked points)