Will or Going To?

Complete the conversation. Use will or going to. Use contractions
Sam you come to the cinema with me and Rob tomorrow?
Ellie No. I’m not. I spend the evening with my sister.
Sam Really? Well, why don’t you come to the cinema? I get two extra tickets.
Ellie We've got other plans. We have dinner in a pizza restaurant.
Sam What time you go out?
Ellie About 8.00. Why?
Sam Maybe we can meet later. I phone you after the film.
Ellie OK.