Hello.
user
Hello, how can I help 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.
assistant
Thank you.
user
May I know your name?
assistant
Lisa Baker.
user
There is no reservation found under your name.
assistant
That's ok, thank you for checking.
user
Thank you for choosing us.
assistant