text: Andy: Where are you?
  Yvonne: 5 stops away
  Andy: I have to go out for 10 minutes
  Andy: but should be back before you arrive
  Yvonne: ok. want me to buy you something on my way?
  Andy: no thanks, brb
target: Andy is going out for 10 minutes, but he will be back to meet Yvonne, who is 5 stops away.