dialogue: #Person1#: This is Manager Liang's office, what can I do for you?
  #Person2#: This is Wang Miao from AB company speaking. Our CEO Mr. Green has an appointment with Mr. Liang tomorrow morning. But there is a minor change in tomorrow's schedule. Mr. Green has an abrupt urgent case tomorrow and he has to go abroad today. He wanted me to convey his apology to Mr. Liang.
  #Person1#: OK! I'll tell him.
  #Person2#: And Mr. Green will make another appointment when Mr. Liang comes back.
  #Person1#: Ok! Thanks for calling.
  #Person2#: Bye!
  #Person1#: Bye!
summary: Mr. Green has to cancel the appointment with Mr. Liang and will make another one later.
topic: cancel the appointment