You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: I would like to book a ticket from Los Angeles to Washington.

ASSISTANT: Sure, may I know the travelling dates?

USER: Departure is by Nov, 9 and return date is Nov, 11.

ASSISTANT: Please help me with your journey codes.

USER: Airport codes are LAX and DCA.

ASSISTANT: Do you have any connection limit?

USER: I would prefer connecting flight.

ASSISTANT: Do you have any other requirements?

USER: I prefer business class.

ASSISTANT: May I know your name?

USER: I am Carol Scott.

ASSISTANT: Please wait a minute.

USER: Sure.

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

USER: Thanks.

ASSISTANT: Thank you for opting us.