text: 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. 
target: Sarah will pick up Amy today instead of Martin.  He's picking her up tomorrow.