I don't know anything about tour operators in Kolkata. But as someone who travels there at least a couple of times a year I suggest you make your own itinerary and travel; plus Bangkok(assuming that's your entry point) is not too far from there and shouldn't be too expensive to book your own flights. It is more fun to explore things on your own plus you don't really need a tour operator in a place like Thailand. People are generally friendly and as far you stay away from people who approach you (most of the time they are harmless too but better avoid and move on).
Let us know the kind of trip you planning(relax at the beach; eating and shopping etc.); people who been there can give you some suggestions accordingly,
@Naujawan most of people here are mutual friends so it is not gonna be wierd definitely.. just make sure you mention your IFN name as naujawan so its easy fro us to accept... like my fb name is acham thavirthan here i kept my nick name to keep it simple
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alas i know many u guys be4
@deb_ban u abcd football.com owner??