Ask for Proof of I.D.

Taking someone’s name is not enough, ask to see their identity card, ask them to state their title.
Asking them to state their title not only helps you to locate them at a later date, but actually lowers their status to you.
Remember, you have no title; you have a status, that of Sovereign; ALL titles have a lower status than you.
If they give their title, you now have authority over them. They may not know this, but you do.
If they fail to give you proof, and it is your right to decide what is acceptable not them, then you can terminate the conversation and decline their offer.