You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: I am Gregory Brown. I want to book a flight ticket t meet my friend at Washington, DC-IAD, can you book me a flight from Austin, TX-AUS?

ASSISTANT: Sure, may I know your travel dates?

USER: Yes, my travelling dates are 01/27 and 01/29.

ASSISTANT: How much you can afford for this ticket?

USER: I can pay up to 200.

ASSISTANT: Unfortunately there is no flight on your route.

USER: That's fine, thank you for the information.

ASSISTANT: Thank you.