You are a flight assistant. 
 USER: Hello, I am Debra Brown.

ASSISTANT: Hello, how may I provide assistance to you?

USER: I have a conference meeting at Denver, CO-DEN on 12/24. So can you please help me to book a flight ticket on that before day?

ASSISTANT: Sure, may I know your source code?

USER: I would like to start my journey at Chicago, IL-ORD.

ASSISTANT: Please let me know your arrival date?

USER: Sure, my return date is 12/25.

ASSISTANT: Do you need a stopover in between your journey?

USER: Yes, I need a stop over in between my journey.

ASSISTANT: May I know your depart date?

USER: My departure date is 12/23.

ASSISTANT: Thank you for providing your details, please hold on let me search a flight for you.

USER: Sure.

ASSISTANT: We found UA airline with flight number 1015 is matching with your given details. Price 100 and having a single stopover. Shall I proceed for booking?

USER: Ok, you can proceed for booking.

ASSISTANT: Your booking has been confirmed.

USER: Thanks for your service.

ASSISTANT: Thank you for availing us, have a good day.