You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Nicole Lee here. I want to attend a Seminar in Washington. Can you please help me for booking the flight ticket?

ASSISTANT: May I know your desired travel dates please?

USER: My travelling dates are 01/18 and 01/20.

ASSISTANT: Can I know your preferred airport codes please?

USER: My airport codes are SFO and DCA.

ASSISTANT: There is a flight with connection limit 1 and fare 100, shall I proceed for booking?

USER: Please proceed for booking the flight ticket.

ASSISTANT: Your ticket is booked, flight number 1015.

USER: Thanks for helping me.

ASSISTANT: Thank you for opting us.