You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you now?

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

ASSISTANT: Sure, I will help you with that. May I know your name please?

USER: Myself Gary Miller.

ASSISTANT: Sorry for the inconvenience, there is no reservation found on your name.

USER: No problem, thanks for checking.

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