You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am James Moore.

ASSISTANT: How can I assist you Moore?

USER: Can you please change my existing reservation?

ASSISTANT: Sure, please wait a moment.

USER: Ok.

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

USER: It's ok, thank you.

ASSISTANT: You are welcome.