text: Caroline: Can you pick up Laura from school today? 
  Caroline: I need to stay longer at work... 
  Tom: Ok. What time?
  Caroline: 3 p.m. 
  Tom: Hmm.. I won't make it at 3  sharp coz I'm still with the clients. 
  Caroline: so, what time?
  Tom:  3.30 if there's no traffic. 
  Caroline: Ok, that should be fine. 
  Caroline: Just text her about it, ok?
  Tom: Ok. 
target: Caroline will stay at work until 3 pm. Tom is with clients, he will picl Laura from school at 3:30 pm. Tom will text Laura about it.