You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you for today?

USER: Due to heavy snow fall, I can not travel. Can you help me in changing my existing reservation?

ASSISTANT: Yes, I can help you with that. Can I know your name?

USER: My name is Paul Anderson.

ASSISTANT: Ok, give me a moment.

USER: Sure.

ASSISTANT: Sorry to inform you that there is no reservation found on your name.

USER: That's fine, thank you for the information.

ASSISTANT: Thank you for consulting us.