What is the relationship between the two speakers?

Mary: Mark. I don’t want to listen to any more of your rubbish. I had enough of you. Don’t try to call me again. I’ll pull out the wire.
Lucy: Hello, Mary. It’s me, Lucy. Don’t hang up.
Mary: Oh, is that you, Lucy? Where did you spring out? I thought you were in Canada.
Lucy: I returned yesterday. The first thing I wanted to do after I went back was to get in contact with my old friends. I had been trying to get you on the phone all morning, but your line kept busy. Just now, when I finally got through to you when the phone went dead on me. Did you slam it down? What’s going on between you and Mark? A War?
Mary: More than a war. A divorce.
Lucy: You are joking, aren’t you? You used to love each other So much.
Mary: It’s all over now. I don’t want to talk about it any more on the phone.
Lucy: Are you free tomorrow? Let’s have a talk.
Mary: Fine. Would you please come over here at 8 o’clock at night?
Lucy: Ok. I’ll call you tomorrow.