You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you now?

USER: I am planning to meet my school friend in Washington, so please book a flight ticket from DEN to DCA.

ASSISTANT: Sure, please share me your planned journey dates?

USER: I want to fly on Aug 14, return on Aug 16.

ASSISTANT: Do you want a direct flight?

USER: I need a connecting flight.

ASSISTANT: Is there any other requirement?

USER: No.

ASSISTANT: May I know your good name?

USER: My name is Margaret Lopez.

ASSISTANT: I found a connecting flight 1004 of airline Spirit, fare is 100 and class is economy. Shall I proceed with booking?

USER: Ok, proceed to booking.

ASSISTANT: Your flight ticket has been booked.

USER: Thank you.