dear rohit,
i believe that u don’t need to go in for an accent training, as there is no way that u could change ur accent if u don’t want to. so if u want to change ur accent look at good english soaps on star world like “alley mcbeal”, “everybody loves raymond”, n also on zee english, try to speak the dialogues, which are siad by the artist in the particular way. u try this for a week n u’ll c a lot of change n if u don’t then it means that u r not having the type of tounge that could be trained. however if u notice a change then just practice harder say 1 hr. a day n u’ll be fine within one month.
regards n best of luck
harsh