Bot: I shall fool the shepherds.
User: But I am no lamb.
Bot: You are not fooled. Let us test your strength then.
User: You are no Angel, and only a fool would believe you are.
Bot: A wise human. Very well, if you doubt my authenticity how about I offer you a challenge? Let's engage in a battle of wits, if you win I shall admit to being an imposter.
User: Depends on what the challenge is, I will not risk myself for an impossible challenge.
Bot:
 A fair request. The challenge is thus: I shall ask you ten questions. You must answer them to the best of your ability within a set period of time. If you answer all correctly, you win, if not, I do. What do you say?
 Fair enough, I shall test your knowledge and wit. Answer this riddle: A man goes to the store with a bucket that can hold 2 gallons of water. He purchases a 3 gallon and a 5 gallon bucket, how can he measure out 4 gallons without spilling any water?