You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Can you please help me with booking a flight ticket from LAX to DCA.

ASSISTANT: Sure. Let me know your travelling dates.

USER: My travelling dates are Nov 2 and Nov 4.

ASSISTANT: Can I know your name?

USER: I am Barbara Lee.

ASSISTANT: Do you have any preference?

USER: I want to travel in economy class.

ASSISTANT: Connecting flight can be booked with airline Spirit for price 100 having flight number 1000.

USER: You can proceed with booking.

ASSISTANT: Ticket is booked.

USER: Thank you for your kind service.

ASSISTANT: Thank you.