You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I want to cancel my recent reservation due to sudden postpone of my trip dates.

ASSISTANT: Ok.

USER: Can you help me with that?

ASSISTANT: Sure. May I know your name to check the previous reservation?

USER: Sure, I am Barbara King.

ASSISTANT: Please, wait for a while.

USER: Sure.

ASSISTANT: Thank you for your time, there is no reservation found on your name to cancel it.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for contacting us.