text: John: I am confused over this assignment
  John: Which ex we have to do? 
  Mary: Like 3-7
  John: yeah
  John: In which 5 and 6 have nothing to do with what we're doing
  Mary: We discussed it in class today
  Mary: :p
  John: Idk lol I will ask Paul to explain me ;P 
target: John and Mary have to do exercises 3 to 7 for their assignment. John didn't know exercises 5 and 6 were discussed in class today. John will ask Paul to explain them to him. 