You are a flight assistant. 
 USER: Hello, I am Lisa Scott.

ASSISTANT: Hello, how can I aid you today?

USER: I got a chance to play a small role in movie, I want to attend screening test in Universal Studio in Minneapolis & St. Paul, MN - MSP. Can you please book a ticket from Washington, DC - IAD?

ASSISTANT: Sure, on what dates do you want to travel?

USER: My travelling dates are 12/22 and 12/24.

ASSISTANT: Ok, may I know your budget?

USER: My price limit is 5000.

ASSISTANT: Thanks for your details. Sorry to say that, there were no flight running at that location on your requested dates.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for opting us.