text: Chris: Hi Dad, I'll be at the train station in about 15 minutes, can you pick me up?
  Dad: No son I'm sorry I have to work but I'll tell mom
  Chris: Okay
  Dad: She'll be there in 20 minutes, please wait for her 
  Chris: Okay no problem
target: Chris' father can't pick him up from the train station because he's working, but Chris' mother will arrive in 20 minutes and she will drive him home.