You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am James Edwards.

ASSISTANT: How may I assist you now?

USER: I would like to visit Washington, can you please help me to book a flight ticket from LAX to DCA?

ASSISTANT: James Edwards, may I know your travelling dates please?

USER: Sure, my trip dates are Aug 05 and Aug 07.

ASSISTANT: Do you have any other preferences?

USER: My departing time is evening.

ASSISTANT: May I know your connection limit?

USER: I need a single connection flight.

ASSISTANT: Do you have any class preferences?

USER: I am fine with any class to travel.

ASSISTANT: Sorry, there are no flights available for you currently.

USER: No problem, thank you for your information.

ASSISTANT: Thank you for choosing us, have a great day.