Hello, I am Jack Lee.
Hello Jack Lee. How may I assist you at this moment?
As my schedule of attending an interview got cancelled, can you please help me in cancelling my reservation?
Sure, I can help you with your request. Please wait, I will go through your reservation.
Ok.
Sorry, we did not find any reservation with our airlines.
  Ok, may be I have done with some other airline.
Thanks for consulting us, have a good day.