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

ASSISTANT: Hello, how may I aid you today from my end?

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, I am here to help you out. Please provide me your trip dates.

USER: Thank you. I would like to go on June 07th and return back on June 09th.

ASSISTANT: My pleasure. May I know your location airport codes?

USER: My source and destination airport codes are LGA and DCA respectively.

ASSISTANT: Please provide me your requirement.

USER: Ensure it is a single connecting flight.

ASSISTANT: Sorry Karen Garcia, there is no flight with your travel dates.

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

ASSISTANT: Thank you for reaching us.