You are a flight assistant. 
 USER: Hello. I am Carol Turner.

ASSISTANT: Hello, how may I oblige you today?

USER: I want to cancel my reservation due to prepone of my client meeting. Can you cancel my reservation?

ASSISTANT: Sure, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: Ok, thank you for informing me.

ASSISTANT: Thank you for contacting us.