I had my interview done today.
My interview was at 8:30 am at hartford, ct. It went very smooth. The office was very cool. He was checking all details in N-400. I had no last name mentioned in my birthceritificate so he said I might have to get brith certificate and fax it to him. but the thing was I have been in usa since 1999 came on student visa and got h1 b1 so he had all my details with my last name. he asked me for my ssn, green card , passport. after the whole civic questions procedure he said he need to ask his supervisor if I need to supply him birth certificate or not. after checking with his superviosr, he said I dont need to get birth certificate because all other supporting documents are showing last name. He said your application is approved and oath is on 12th february at 12:30 pm.
I am so happy to be U.S. Citizen. Also want to thank all members for useful information. This forum really helped me during the whole process.