You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Can you please change my existing reservation?

ASSISTANT: Sure, I am here to help you. May I know your name to check further?

USER: Kevin Thompson here.

ASSISTANT: Please wait a moment.

USER: Ok.

ASSISTANT: Thank you for waiting. Kevin Thompson, regret to inform that there is no active reservation fond under your name to amend.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for reaching us.