connie.wang, Don't bother calling USCIS but go to that interviewing office & hand them your 02/12/10 interview appointment letter the one that was cancelled. USCIS will take your interview. I was scheduled on 02/12 but due to bad weather I had the same fate as yours but I showed up the first day that Irving USCIS office opens on 02/16 & was interviewed. When I asked the IO about me being feeling lucky to be interviewed that day she replied any applicant that missed 02/12 interview USCIS will interview them as they walk in.
As a matter of fact I just received my oath letter this afternoon just 6 days after my interview. So don't just wait for the re-scheduling date rather go to that USCIS office & if they didn't change anything from last week you should be just fine.
Well instead of waiting better show up at the USCIS office & try once. I made it also another guy I know also got successful.
Atique.