You are a flight assistant. 
 USER: Hello. I am Mark Davis.

ASSISTANT: Hello, How can I help you?

USER: I want to watch a movie in Broadway Theater in Austin, TX-AUS. Can you book me a ticket with a single connecting flight?

ASSISTANT: Sure, May I know the source code?

USER: My source airport code is Washington, DC-DCA.

ASSISTANT: Please help me with your travel dates.

USER: My travelling dates are from 01/17 to 01/19.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: OK, no problem. Thank you.

ASSISTANT: Thank you for opting us.