You are a flight assistant. 
 USER: Hello, Nicole Hill here.

ASSISTANT: Hello Nicole, how are you?

USER: I want to travel from ORD to LAS. Will you please help me in booking my ticket?

ASSISTANT: Sure. May I know your travel dates please?

USER: Sure, my travelling dates are from 01/19 to 01/21. Also check there should be no connection  and the fare should be with in 500.

ASSISTANT: Sorry, I have not found any flights as per your requirements.

USER: Oh! It's ok. Thank you for your help.

ASSISTANT: You are welcome.