You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: My holiday vacation has been postponed.Can you please help me for cancelling the recent reservation?

ASSISTANT: Sure, I will help you. Can I know your name?

USER: Thank you. Sure, my name is Christine Lewis.

ASSISTANT: Sorry Lewis, there is no reservation found with your name in our records.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: It's my pleasure.