text: Zoe: Good morning
  Caleb: good morning
  Zoe: how r u?
  Caleb: ok just work late last night. and what are u doing now?
  Zoe: i woke up some time ago and now just watching tv. u?
  Caleb: I'm thinking about what time to come and see u?
  Zoe: but for sure u can make it and come to London today?
  Caleb: i just have to do one thing but yes i am sure
  Zoe: :)
  Caleb: what time is ok for u?
  Zoe: what do you think about
  Caleb: I can be there at 4pm
  Zoe: just in case what time do u have the next bus? i'm asking because my student asked me if we can have a lesson today till 4:30pm
  Caleb: If i take the next bus, I will arrive at 6 pm. Do you think it's ok, not too late for you?
  Zoe: or you know what.. i will ask this guy if we can have this lesson tomorrow
  Caleb: i want to have more time with you today and i will have my bus back at 9:30pm
  Zoe: ok. 
  Caleb: So it is up to u
  Zoe: so i will postpone the lesson
  Caleb: ok. sorry the bus back will be at 11pm
  Zoe: oh ok
  Caleb: ok so i will buy it now and will you meet me at Bus station?
  Zoe: yes
  Caleb: ok
target: Caleb will visit Zoe today at 4pm. Zoe needs to reschedule private tutoring. Caleb will come back at 11pm.