Martin: Can you pick Amy up?
Sarah: Why are you asking? I thought you're picking her up? Don't tell me you have to stay late.. again!?
Martin: I have to. It's about that project.. so sorry.
Sarah: Right, ok. But I can't pick her up tomorrow I've got a doctor's appointment. 
Martin: That's fine. I'll do it promise. I'm trying to have things done by tomorrow.
Sarah: Ok. Fine. 
Sarah will pick up Amy today instead of Martin.  He's picking her up tomorrow.