You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I am Brian Moore.

ASSISTANT: Ok.

USER: I need to change my existing reservation, Can you please help me with that?

ASSISTANT: Sure, I am here to help you, please wait for a while.

USER: Sure.

ASSISTANT: Sorry Brian Moore, no reservation found on your name.

USER: Ok, no problem.

ASSISTANT: Thank you for approaching us.

USER: Thanks for your information.