[听力原文]
W: The mailman just dropped some mail in our box, Grandpa.
M: Probably lots of advertising and bills. Nothing interesting.
W: You were right, Grandpa. Advertising, bills, bills, advertising... Oh, You won’t believe it, but there is a letter here addressed to you, Mr. Michael Edward, and it looks like a personal letter.
M: Oh, it must be a bill.
W: I don’t think so. The return name and address is Peter Waters, RFD Number 1, Chesterton.
M: You are joking. Peter Waters
W: Yes, Peter Waters, you know him
M: Do I know Peter Waters You bet I do! He was my roommate in college. He visited with Grandma and me in Florida about five years ago.
W: What does he say Is he OK
M: Let me put on my glasses and read it... Yeah, he’s fine. He’s writing to invite me to spend a weekend with him on his farm. He’s planning a get-together with two or three other college friends. Kind of a fifty-year anniversary reunion.
W: Sounds like fun. Fifty years Wow! What kind of farm does he have
M: I’ve never been there, but he has chickens and cows and all. That means fresh eggs and fresh milk.
W: Does he have a family
M: No, he doesn’t. He never married. He’s not as lucky as I am to have a family and grandchildren. I’m a lucky man.

With whom is the man speaking（）