You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: William Mitchell here. I need to change active reservation because my brother marriage was cancelled.

ASSISTANT: Sure, please wait for a moment.

USER: Sure.

ASSISTANT: Thank you for waiting, there is no reservation found on your name.

USER: It's ok, thank you for giving information.

ASSISTANT: Thank you for reaching us, have a nice day.