You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I abet you?

USER: I am Christine Young. I want to cancel my reservation due to postpone of my sister's wedding.

ASSISTANT: Sure, please wait for a while.

USER: Sure.

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

USER: Ok, thank you for response.

ASSISTANT: Thank you for choosing us.