You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I am Amanda Martin. I would like change my recent reservation due to my brother marriage is cancelled.

ASSISTANT: Ok, please wait for a while to check your reservation.

USER: Sure, take your own time.

ASSISTANT: Thanks for your time, there is no reservation existed on your name.

USER: Thank you for checking and giving information.

ASSISTANT: Welcome Amanda Martin.