You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you today?

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

ASSISTANT: Sure, we are here to aid you.

USER: Thank you.

ASSISTANT: May I know your good name please?

USER: Myself Raymond Allen.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Sorry, there is no reservation on your name to change.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for choosing us.