dialogue: Carla: I've got it...
  Diego: what?
  Carla: my date for graduation. Hope you're coming
  Diego: if you tell me when...
  Carla: oups sorry. June 4th
  Diego: we've got time.
  Carla: of course, but you have to book your plane
  Diego: i still  don't know, and it's quite expensive
  Carla: that's why you have to book it right now. Please tell me you'll come
  Diego: i'd love to for sure
  Carla: come, come, please
  Diego: ok, i'll have a look and tell you.
  Carla: you could stay  home for the week, my roommate won't be there.
  Diego: didn't you tell me your  parents would come?
  Carla: yes they will, but they've got friends they could stay with.
  Diego: what was the company you flew with when you came last month?
  Carla: aeromexico was the cheapest at that time, but check with delta
  Diego: i think there is some flight comparison websites and also some apps.
  Carla: i only know the canadian one
  Diego: don't worry i'll find out 
  Carla: ok ! i've to leave you. tell me soon
  Diego: i will. good night
summary: Carla's date for graduation is on June 4th. Diego will try to come then.