You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Myself James Young.

ASSISTANT: Hello Young.

USER: I want to change my existing reservation, can you help me for that?

ASSISTANT: Ok, please wait for a moment, I will check it.

USER: Ok.

ASSISTANT: Sorry Young there is no reservation on your name.

USER: Ok, no problem.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your services.