text: John: We're going to dive the blue whole this summer
  Jeremy: We've decided yesterday
  Anna: wow, it's a bit expensive, isn't it
  Jeremy: not that much if we plan it well and in advance
  Maria: Where is it actually?
  John: in the Caribbean 
  Jeremy: More precisely in Belize, off the Caribbean coast of course
  Anna: I read about it a lot, it seems quite amazing
  Jeremy: Lonely Planet says: "In the 1970s, underwater pioneer Jacques Cousteau explored the sinkhole and declared the dive site one of the world's best."
  Anna: the famous Cousteau!
  John: yup, wanna join us?
  Anna: I'd really like to
  Maria: let's talk about it tonight
  John: ok
target: John and Jeremy are going to dive the blue whole this summer. It's in Belize. Jacques Cousteau declared it one of the world's best dive sites. Anna and Maria would like to join them. They'll talk about it tonight.