text: Hana: how about a walk?
  Rita: at this hour?
  Hana: I need 2 talk
  Rita: sth happened?
  Hana: don't know yet
  Rita: ok, give me 15 min
  Rita: I'll come
  Hana: ok, thx
target: Hana and Rita are going for a walk and talk in 15 minutes, although it's late.