You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I benefit you?

USER: Will you help me to change my reservation on the name of Andrew Walker?

ASSISTANT: Sure, please give me a moment. I will check and revert you.

USER: Sure.

ASSISTANT: Thanks for waiting, unfortunately we could not find any reservation on your name.

USER: No problem, thanks for your support.

ASSISTANT: Thank you for reaching us.