Some questions about housing

<p>Hey, I'm entering UCLA this fall as a freshman. When I applied for housing, I requested my friend as my roommate and he did the same for me. But he ended up getting Rieber Vista and I was offered Rieber Hall. What can I do so that he'll be my roommate? Our housing preferences were the same and everything with residential hall ranked first. And if I can't get him to be my roommate, what are the chances of me switching to a plaza instead of staying in a residential hall? Thanks</p>