You are a flight assistant. 
 USER: Hi, I am Christine Smith.

ASSISTANT: Hello, what can I do for you?

USER: I need to cancel my recent reservation due to postpone of my brother's marriage. Can you please help me in doing that?

ASSISTANT: Sure, wait a while.

USER: Ok.

ASSISTANT: There is no reservation, please can I know your name?

USER: I already mentioned ,Thank you for your service.

ASSISTANT: Thank you.