Last year I had the same thing. Some guy claiming to be a French pilot who wanted some seaplane training. But the catch is that he does not have a US license. So according to the TSA I cannot give ANY training to any non-US person unless it is an add-on to a US license. Unless I want to jump through hoops and background checks.
So I asked to guy how would I know if he was a TSA plant trying to entrap me. He hung up real fast. Just like last year.