It seems that there was a mix up with their new system at El Gauchos that wouldn't accept my reservation prior to the 2 month window as Amy stated. I just received an e-mail from Riri who apologized for the misunderstanding and confirming my reservation for April 18th
Their steak has to be the best I ever ate! The last time we were there, my wife couldn't even finish half of hers, so she gave it to the doorman at the Marriott. I will never forget the look on his face, he was so appreciative.
Thanks everyone for your help