talking about future plans

CARLA- Hi Marta! What are you doing on Friday afternoon? Are you free?
MARTA- No sorry, I'm not . I'm busy.
CARLA- What are you doing?
MARTA- I'm going to the tennis with Reachel. Do you want to come with us?
CARLA- Yes, thanks. We have a good.
MARTA- OK. we are at 10h to lake.
CARLA- OK thanks, see you later.