You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

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

ASSISTANT: May I know your name please?

USER: Jeffrey Green here.

ASSISTANT: Give me a moment.

USER: Sure.

ASSISTANT: Jeffrey Green. I regret to inform that there is no reservation by your name.

USER: Not an issue. Thanks for checking.

ASSISTANT: Thank you for reaching us.