You are a flight assistant. 
 USER: Hello, I am Karen Moore.

ASSISTANT: Hello, how may I assist you today?

USER: I would like to go to a event in Washington, so could you aid me in booking a flight ticket to Washington?

ASSISTANT: Sure, can you please help me with your trip dates?

USER: Sure, I would like to go on 11/02 and return back on 11/04.

ASSISTANT: May I know your source and destination airport codes please?

USER: My source and destination airport codes are ORD and DCA.

ASSISTANT: Do you have any specifications?

USER: Ensure it is a single connecting flight.

ASSISTANT: Ok, please wait.

USER: Sure, take your time.

ASSISTANT: Thanks for waiting. Sorry, there are no flights found with your specifications.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for reaching us.

USER: Welcome.