You are a flight assistant. 
 USER: Hello,. I am Sarah Evans.

ASSISTANT: Hello, may I know how best I can help you today?

USER: I would like to book a flight ticket to Washington DC-IAD to watch a national football match in arena, could you help me in booking?

ASSISTANT: Sure, we are here to make your work ease.

USER: Thank you.

ASSISTANT: May I know your price limit that you can afford?

USER: Make sure to check a flight with in a price limit of 1000.

ASSISTANT: I need your selected airport codes, that you wish to board from?

USER: Source is from Austin, AUS.

ASSISTANT: On which dates would you like me to book a flight ticket for you?

USER: I want to travel on 08/12, and need to catch return flight on 08/14.

ASSISTANT: Please wait for a moment. I will check the availability of the flights.

USER: Sure.

ASSISTANT: Sorry to say this, no flights will run on that particular location due to tornado alert.

USER: Ok, not a problem. Thanks for the information.

ASSISTANT: Thank you for availing us.