If they have done such a good job with a back and forth conversation that A) I can't tell it's fake and B) it has useful information then the only thing I have

If they have done such a good job with a back and forth conversation that A) I can't tell it's fake and B) it has useful information then the only thing I have to say is https://xkcd.com/810/ https://xkcd.com/810/ -edit- also my point was about conversations that are significantly longer and more substantive than the ones you describe. That actually get into details, with back and forth.