text: Al: Ben, I can't find my key to room 122
  Ben: Oh
  Al: I got into the classroom while you were leaving and probably put it on the desk just before you left. I only saw it was missing at the end of the class... can you check if you took both keys when you left the room?
  Ben: Let me see
  Al: Ok
  Ben: Ouch, yeah, I just found your key in my pocket...
  Al: That's ok, I'll just tell the janitor, they only have two keys
  Ben: Ok, I'll be at the university tomorrow and will hand it back
  Al: Ok, thanks
  Ben: By the way, wanna drink a beer after work tomorrow? It's on me since all this trouble is my fault
  Al: Fine for me! And we both made a mistake... but hey, if it's on you it's on you, haha!
  Ben: Ok, see you tomorrow then
  Al: Ok, bye
target: Al can't find a key to room 122. Ben accidentally took it. He'll bring it back to the university tomorrow.