I have two suggestions of how i think bani might end up in dubai, but it might be a completely different reason.
1) jai and Pia go off to their conference meeting in dubai and then massi tells bani to tell jai the truth as soon as possible. So she follows them out there only to find pia and jai becoming close. Hopefully she will get hurt and jealous and jai will show that he cares for pia and not bani, just to get back at her.
2) bani finds out that jai's life is still in danger and the men are still after him. She then goes to Dubai to tell him his life is in danger or to save him yet again (our wonder woman!) I was just wondering, it could be that the people after Jai are his competitors (the one that bani works for or worked for). I somehow don't think ranveer would stoop that low! Unless of course the people that she works for tell her that she also has to go to dubai for the conference. that's another suggestion that has just come to mind.