Just got another no at Ridgecrest, CA for 4/23/2019. Apparently all the rooms that they have reserved for Diamonds have been taken. Er, no hold on, it's booked more than 110%. Er,no, wait, no it's a special blackout date. Three different excuses given by a 'customer no-service' agent when I called and escalated today. Diamond guarantee is such a joke, but I am done laughing.