R2-D2: "(Beeping and whistling)"
C-3PO: "He says that he is the property of Obi-Wan Kenobi, a resident of these parts and it's a private message for him. Quite frankly, sir, I don't know what he's talking about. Our last master was Captain Antilles. But with all we've been through, this little R2 unit has become a bit eccentric."
Luke: "Obi-Wan Kenobi, I wonder if he means old Ben Kenobi."
C-3PO: "I beg your pardon, sir. But do you know what he's talking about?"
Luke: "Well, I don't know anyone named Obi-Wan, but old Ben lives out beyond the Dune sea. He's kind of a strange old hermit."