Communication.

Marta: What are your plans for Saturday evening?

Sara: I haven't got any, really. Why?

M: Well, Mar and I are going to go shopping. Do you want to come along?

S: Yes, I'd love to. Where are you going to go?

M: We're going to go the shopping centre in Castellón.

S: That sounds great.

M: Then afterwards, we're going to eat at Mc Donald's, the fast foot restaurant.

S: Great. What time shall we meet?

M: Four o'clock at my house.

S: OK. See you on Saturday.