I want to speak english fluently?

I WORK IN A COMPANY.BUT I DON'T GET THE TIME TO TALK TO ANYBODY.I AM VERY BUSY AND ALL THE COLLEAGUES ARE BENGALI.I WANT TO SPEAK ENGLISH FLUENTLY TO EASE MY WORK.PLS HELP ME;DAILY I READ NEWSPAPERS I ALSO READ NOVEL.MY VOCABULARY IS NOT BAD.I AM M.A IN ENGLISH.MY ONLY PROBLEM IS THAT MOST OF THE TIME I SPEAK IN HINDI SO WHEN I START TO SPEAK ENGLISH I DON'T GET FLUENCH.I WANT ONLY FLUENCY NOTHING ELSE.