Kavya-Santu and Kavya-Omi's conversations were also quite good. Not sure, how much it will effect the story further or at least effect Kavya later though, as she was drunk (may not remember anything later).
Santu may contribute something later if Kavya would have some try to inquire something about what happened that night. But, not sure, how will Omi react to what he heard from Kavya now.
Have to wait and see, if these conversations contribute anything to the story or would be meaningless in the end.