text: Sharon: have you seen Harry today?
  Benjamin: at the canteen at lunchtime 
  Ali: me too, we ate together
  Sharon: and later?
  Josh: he left the building about 30min ago
  Josh: told me he was going to get his hair cut
  Sharon: damn it! the system has just collapsed, we need him
  Josh: so it must wait I guess
target: Benjamin and Ali had lunch with Harry today at the canteen. He left 30 minutes ago to go to the hairdresser, as Josh reports. The system just collapsed and Sharon needs Harry's help.