You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Paul Walker here.

ASSISTANT: Paul Walker, how can I help you today?

USER: I want to travel from ORD to LAS for attending a Marriage. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, Paul Walker, I will help you with that flight ticket booking. May I know your preferable travel dates?

USER: My travelling dates are from 04/30 to 05/02.

ASSISTANT: Sorry to say that, there are no flights available in your route as per your travel dates.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for contacting us, have a great day.