Change in the booking system. Because we're already restricted when it comes to the days for practice and it's a hassle just to book the 1st class. i ended up giving my voucher to a friend because I could never call to book and even she had a hard time to get someone to call back. If at least we could book online straight away even with the restricted day it would be ok, but the current system for Groupon voucher holder need to be changed.