You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Jerry Martinez here.

ASSISTANT: How may I assist you?

USER: Can you please help me in booking a flight ticket from AUS to DCA?

ASSISTANT: Sure, I am here to help you out. May I know your travelling dates please?

USER: Sure, my travel dates are from Nov 24 to Nov 26.

ASSISTANT: How much you can afford for airfare? Do you have any specific airline preference?

USER: I can afford 200 for my reservation. I would like to go with normal cost.

ASSISTANT: Do you have any time specifications?

USER: Yes, my departure time is in the evening.

ASSISTANT: Wait a moment please.

USER: Sure.

ASSISTANT: Jerry Martinez, there are no flights available in your route.

USER: That's ok, no problem. Thank you for the information.

ASSISTANT: Thank you for choosing us.