text: Carla: Hi, do I teach today?
  Mona: Yes. 
  Carla: OK, cool.
  Mona: You'll have 7 people.
  Carla: Wow, it's getting better. Good to hear that :) 
  Mona: Yes :)
  Carla: Ah, almost forgot. I'm leaving town 6-12 December. Do you want me to find someone to teach the class on the 8th? 
  Mona: I don't know. I'll ask Mary. 
  Carla: OK. Let me know.
  Mona: A propos, do you want to teach 22nd and 29th?
  Carla: 22nd - yes. 29th - no. 
  Mona: Noted. 
  Carla: And what about the 2nd January?
  Mona: I'll ask the girls wheather they want to come. Becasue the studio is open. 
  Carla: Ok, great. In touch. 
target: Carla is teaching a class of 7 today. She will be absent 6-12 December. She can teach on the 22nd but not 29th. Mona has to confirm January 2nd classes.