dialogue: W: 6652-767. M: Hello. Could I speak to Alistair, please? W: Speaking. Is that you, Bill? M: Hello yes, it's me. I didn't recognize your voice. W: I've got a bit of cold. What can I do for you? M: Well, we're meeting Bob's girlfriend and her parents tonight giving them dinner. I've just opened the box of champagne glasses and there are two glasses missing. Have you got a set you can lend to me, by any chance? W: Sure, sure, glad to. When do you need them? M: Well, can I come over in a quarter of an hour? I've got to go to Marilyn's for some sugar first - I've run out of that as well. W: Is that all you need? Anything else you are short of? M: No, I think I'm all right otherwise. Thanks a lot, Alistair. See you in a bit. W: Bye.
question: Who may Alistair be?
choice: Bob's girlfriend. Bill's friend. Marilyn's sister.
answer: Bill's friend.