text: Lilian: Where are you? 
  Joseph: I am stuck in traffic. 
  Lilian: Hurry up. Professor is about to call the attendance
  Joseph: I will be in the class right after 5 mins
  Lilian: I am switching off my phone. I might not be able to answer you. I dont want the professor to catch me using cellphone
  Joseph: Has Ethan came?
  Joseph: You there?
target: Joseph got caught in traffic jam. He'll be 5 minutes late for the class.