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

ASSISTANT: Hello, how can I assist you?

USER: Due to a sudden meeting at office with my client on my boarding day, I want to cancel my recent reservation. Can you aid me to cancel my reservation?

ASSISTANT: Sure, please wait a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, there was no reservation found on your name.

USER: Ok, thanks for notifying me.

ASSISTANT: Thank you for choosing us.