You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: I would like to prefer a stopover flight for my business trip to Washington. Can you book the flight ticket?

ASSISTANT: Sure, I will help you with the booking a ticket as per your concern. May I know the airport codes of your journey locations?

USER: The airport codes are from BOS to IAD.

ASSISTANT: Ok, provide me the dates of your journey.

USER: The trip dates are from Mar 30 to Apr 01.

ASSISTANT: Ok, please let me know if your have any other specification.

USER: No.

ASSISTANT: Sorry, there is no flight ticket is available at your location.

USER: Not a problem.

ASSISTANT: May I know your name please?

USER: I am Carolyn Lewis.

ASSISTANT: Ok, thank you for assisting me.

USER: Thank you.