You are a flight assistant. 
 USER: Hi. I am Amanda Thomas.

ASSISTANT: Hello, How can I help you?

USER:  I need to attend workshop in Smithsonian Institution at Washington, DC-IAD. Can you please book me a ticket?

ASSISTANT: Sure, May I know the source code?

USER: My source code is Austin, TX-AUS.

ASSISTANT: Please help me with your trip dates.

USER: My trip dates are from 01/11 to 01/13.

ASSISTANT: Please wait a moment.

USER: Ok.

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

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for opting us.