You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Daniel White.

ASSISTANT: How can I assist you?

USER: Due to heavy snowfall, I can't travel. Can you please change my existing reservation?

ASSISTANT: Sure, let me check your reservation status.

USER: Ok, take your time.

ASSISTANT: Sorry, no reservation found under your name in our database.

USER: Its ok, thank you for the information.

ASSISTANT: Thank you for choosing us.