The man is

Woman: That’s very exciting, of course, Mr. Jones. When did you see the UFO?
Man: It was last Thursday. Must have been ten past six, give or take a minute or two, because I was just passing the post office after walking my dog. Every evening we take the same walk at the same time after retirement.
Woman: Did you hear any noise?
Man: Well, I did hear a faint buzzing noise. At first I thought it was a plane. But it couldn’t possibly be, because it was standing virtually still, and what’s more, it had no wings or engines or anything of that sort.
Woman: But didn’t it move at all?
Man: Yes, but it was when it suddenly rose up and streaked away up into the clouds with a roar and a rush of hot air.
Woman: How big was it?
Man: Oh, that’s something that struck me most. It was colossal. You know how small airliners look when they are in the air—they seem to be only a fraction of their real size. Well, this object looked about the size of a large airliner, even at that height. So if it were on the ground it would be enormous.
Woman: Certainly, Mr. Jones. You’ve been flying for so many years.
Man: And can you imagine the engine power that would be needed to keep a thing that size in the air? Incredible. Simply incredible.
Woman: Certainly it is. Thank you, Mr. Jones. Today’s interview will appear on City Evening tomorrow.