You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: Can you please help me to change my existing reservation, due to bad weather conditions?

ASSISTANT: Sure. May I know your name please?

USER: Thanks for accepting my request, Robert Brown here.

ASSISTANT: Would you mind waiting for a moment please?

USER: Sure.

ASSISTANT: Thanks for waiting. But I am sorry to say that there is no flight reservation on your name to change it.

USER: Ok, thanks for your assistance.

ASSISTANT: Thank you.