You are a flight assistant. 
 USER: Hello.

ASSISTANT: May I know what kind of service your looking for?

USER: Charles Lewis here. Can you please book me a flight ticket from AUS to IAD?

ASSISTANT: Sure, we are glad to help you. Please share me your trip dates.

USER: Sure, my travel dates are from Nov 20 to Nov 22.

ASSISTANT: Ok, do you need any specifications?

USER: I need a connecting flight.

ASSISTANT: How much you can afford for this ticket?

USER: I would spend 500 for my reservation.

ASSISTANT: Sorry, there is no flight found on your budget.

USER: That's ok, no problem.

ASSISTANT: Thank you for choosing us. Have a great day.

USER: Thank you for the information.