Interview was moved to a different district, although I didn't move out of district
Here is my short story. Me and my wife applied in March, 2016. We were scheduled for interview in SF district for August, 4. Few weeks before the interview we submitted address change request and later got our confirmation letters. The new physical address is the same city and the mailing address is the different district. Everything remain same for my wife but something wrong happened to my case. It was cancelled and in few days scheduled again for August 30 but in the _different district_ - the Santa Clara district where my mailing address is in.
Mr. Khanna is very competent, and is supported by a very prompt and proactive staff. He suggested me one of the best ways, given my situation, to obtain permanent residency (Green Card), and navigated through the various questions from the USCIS expertly. As a legal professional (from a different field of law), and as someone who has dealt with a few other immigration attorneys, I rate him and his practice among the best. Highly recommended!