She wants to check the room by using the certificates Enjoy 1 night at best available rate & receive 2nd night complimentary at Hilton Pattaya but at hilton pattaya not join. She wants to c check that can use voucher which one best price on 26 July, but in this month. Rooms in the fully booking, voucher is available in August. She asked, why not? her membership with special privileges. I was informed that a number of rooms that can have fully booking can change into August or not? she was to call back again.(the number did not in the system).