E-mail him again!!! From your AZCOM e-mail this time. I sent him a very polite e-mail on late Friday night telling him that I had heard from future classmates that they had received their assignments. I re-listed my preferences and cited the day that I had originally e-mailed him. I received an e-mail back at 6:30 Saturday morning.
"I am sorry, DbDan, I didn't have your previous e-mail in the file to make assignments; if I received it and failed to file it properly, I apologize. I know that there are LA spots available and I will assign you to LA on Monday, and send you a confirmatory e-mail at that time. I look forward to meeting you, and to having you at AZCOM in the fall!"
If you haven't heard, e-mail him again or call. It is possible that early e-mails were misplaced or incorrectly filed!