Even if it's a situation of referring to get a bonus from those who register using your affiliate link, this base is a different one. From the pictures the OP shared, it was clear that the unknown person advised him or her to make a purchase of a particular coin from one exchange and send it to another exchange for selling and make a little profit out of it based on the two exchange market difference but there could be more to it than that simple guide. What I see in this whole thing is someone trying to build trust with who they plan to scam soon.