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

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, may I know your planned travel dates?

USER: I would like to start my journey on Dec 30th and return back on Jan 01st.

ASSISTANT: Could you please provide your journey airport codes?

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

ASSISTANT: Do you prefer either a business class or an economy class?

USER: I will prefer to go on business class.

ASSISTANT: May I know your connection limit?

USER: Ensure it is a single connecting flight.

ASSISTANT: Ok, please wait for a minute.

USER: Sure, take your time.

ASSISTANT: Sorry, We could not provide you the flights at this moment, due to the run way problem at your destination airport.

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

ASSISTANT: Thank you for choosing us.

USER: Welcome.