Why does Ruth call Jackie?

W: Hi, Jackie! We’re going to a farewell party on Friday evening. Would you like to come?
M: To a party? Ruth, I’d love to! Whose party is it?
W: My friend, Ben. He’s going to Paris on Saturday. He’s got a great job with a French magazine.
M: Wow! Good for him. Is he having a party at his flat?
W: Yes. He’s arranged for a DJ and is cooking some French food. It should be good!
M: Who else is going?
W: Well, some of Ben’s friends from work and us.
M: That sounds good. What time are you going?
W: About nine o’clock. The party is at ten.
M: I’d like to go with you. I’ll meet you at your fiat at a quarter to nine.
W: No problem. See you then.
M: Thanks again, that’s really nice of you. Bye.