text: Hazel: hey 
  Jason: Hi Hazel
  Jason: I texted Marc
  Jason: he is going to replace you today 
  Hazel: Aw thanks a lot for your help
  Hazel: I have to go see my mother today
  Jason: That's fine 
  Jason: Let us know if you're going to be on Tuesday so that I can find a replacement for you
  Hazel: Thank you
  Hazel: I will probably let you know by tomorrow 3pm
  Jason: No worries
  Jason: Take care
  Hazel: Thank you! 
target: Jason has texted Marc, who is going to replace Hazel today, as she has to go see her mother. By tomorrow 3 p.m. she will let Jason know if she's going to come on Tuesday. 