Hello.
user
Hello, how can I aid you?
assistant
 I would like to cancel my flight reservation as my trip got postponed, can you please help me?
user
Sure, I am here to help you. May I know your name to check with existing reservation?
assistant
I am Ruth Adams.
user
 I have checked in reservation list to cancel your ticket, but could not find any reservation with your name.
assistant
That's ok, thank you for checking.
user
Thank you for choosing us.
assistant