Hi Sangita,
I guess you are from India (Pune?) , I think you mean Fort Dauphin, it's located in the south of madagascar, the big project there is QMM , will you be working for this project?
There is a daily flight from Tana to Fort Dauphin.
My parents have a guest house in Antananarivo (Tana) , they can help you if you need. But I personally do not know about accomodation in Fort Dauphin.