You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello. How can I provide assistance to you today?

USER: Please book a ticket from Washington DC-DCA to San Francisco, CA-SFO.

ASSISTANT: Sure, may I have your name please?

USER: I am Karen Lee.

ASSISTANT: What are your planned travel dates?

USER: My travelling dates are from 05/10 to 05/12.

ASSISTANT: Do you prefer any way station?

USER: Connections limit 1.

ASSISTANT: May I know your fare for a ticket?

USER: Price limit 200.

ASSISTANT: We found a flight in Spirit airline witch exactly matches your specifications. Shall I proceed?

USER: Please proceed.

ASSISTANT: Your booking has been confirmed with 1027 Flight number.

USER: Thanks.

ASSISTANT: Thank you, have a good day.