What is the relationship between the two speakers?

M: Well, here we are-not too crowded.
W: Great ! Let’s order quickly so we can chat a little.
M: OK. What are you in the mood for?
W: Something light. I went out for pizza at lunch and I’m still full.
M: There are three salads. Or you could have soup and a sandwich.
W: What are you having? A hamburger, I suppose.
M: No, actually I ate out last night too, but we had fast food at McDonald’s, then ate snack at Kentucky Fried Chicken.
W: Oh, dear. Well, maybe you should have the chicken salad.
M: Yes, I think so. Look, the daily special is spaghetti. That sounds good.
W: Oh, the prices are great, too. I’ll have that as well.
M: Now let’s decide on drinks.
W: I’ll just have coffee and a glass of iced water.
M: Italian food needs red wine, you know.
W: But we have to get back to work.
M: OK, a Coke then.
W: Here comes the waitress. Let me order first.