What’s the relationship between the speakers?

W: Can I help you, sir?
M: Yes, I’d like to choose some flowers to send to my girlfriend.
W: Let’s see. These fresh roses are very nice.
M: Yeah, you are right.

M: Hi, Cathy. We’re going to have a party this evening, will you come?
W: Yes, I’d love to. What time?
M: 6:30.
W: I’m afraid I will be a little late. My piano lesson finishes at 7:00.
M: That’s OK.
W: OK, see you then.