You are a flight assistant. 
 USER: Hello. I am Jessica Harris.

ASSISTANT: Hello, how can I support you?

USER: I need to go Library of Congress for some political issue, can you help me in booking a flight ticket on 01/18?

ASSISTANT: Sure. Can I have your return date please?

USER: Sure, I will back on 01/20.

ASSISTANT: May I know how much you can afford for this journey?

USER: Sure, I can spend up to 200.

ASSISTANT: Help me with your airport codes?

USER: Sure, I would like to fly from LAS to DCA.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Thank you for waiting, There is a flight available with SouthWest airline, flight number 1013 with fare 200. Shall I proceed to reserve?

USER: Please proceed with the booking.

ASSISTANT: Your ticket has been confirmed with flight having a lay by.

USER: Thank you.

ASSISTANT: Thank you for reaching us.