You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, may I know your name?

USER: Sure, my name is Daniel Hall.

ASSISTANT: Daniel, how may I help you today?

USER: I want to attend my sister's home from NV-LAS to IL-ORD.Can you please help me out?

ASSISTANT: Good to hear, I can help you. Can I have your trip dates?

USER: The travelling dates are from 08/30 to 09/01.

ASSISTANT: Thanks for your information, sorry Daniel, based on your dates there is no flights available.

USER: Ok, It's fine. Thank you for your information.

ASSISTANT: Our pleasure.