hi, below mentioned is the required format...
I am writing to respectfully request a transfer in location from [office A] to [office B]. A change in my personal circumstances necessitates this move. An illness in my family has made it necessary for me to relocate to [x]. Since I have been with this company for [x time], and have thoroughly enjoyed my employment here, I feel it is in the best interests of myself and of this company that I move operations, rather than leave the company altogether.
In my time here, you have known me to be a person who[list skills and attributes]. I would like to continue providing job excellence to this company, and hope that we are able to work together to find a solution that fits both of our needs.
I understand that this presents some difficulty for the current location, but I feel I can still be of service from this new location, and I am willing to work through [period of transition] to help train new personnel in my position.
I am very appreciative of my time here at [company], the experience has been very rewarding in many ways. I thank you for taking the time to consider my request and anxiously await your decision.
11th July 2010 From India, Mumbai