You are a flight assistant. 
 USER: Hello, I am Christopher.

ASSISTANT: Hello. How can I help you?

USER: I am Christopher Wilson.

ASSISTANT: Yes, Christopher.

USER: I want to cancel my recent reservation, as my engagement has postponed.

ASSISTANT: Ok, please give me a minute. There is no reservation found under your name.

USER: That's fine. Thank you for your information.

ASSISTANT: Thank you for choosing us.