You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I would like to book a ticket from DCA to SFO, can you please help me out?

ASSISTANT: Sure, I am here to help you. May I know your trip dates?

USER: I am travelling on these dates Sept 17th and 19th.

ASSISTANT: May I know your name?

USER: Jonathan Taylor here.

ASSISTANT: Do you have any connection limit?

USER: I need single connected flight.

ASSISTANT: Is there any preferences?

USER: I don't have any other preferences.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Here, there is a flight with 1 connection in Southwest airlines and price is 200. Shall I book?

USER: Ok, you can proceed.

ASSISTANT: Ok, your ticket has been booked with the flight 1000.

USER: Thank you for your services.

ASSISTANT: Thank you for reaching us.