text: Lisa: hi, Kevin and I were thinking about meeting this week
  Lisa: and it turned out that today would be the best
  Lisa: do you want to join?
  Arthur: sure ;-) when??
  Rachel: I'd like to, but I've made other plans :(
  Kevin: :<
  Lisa: I finish work at 4
  Lisa: sooo 4:30?
  Arthur: ok
target: Arthur, Lisa and Kevin are meeting today at 4.30. Rachel cannot join them.