You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you today?

USER: I am Robert Johnson, help me in booking my flight ticket from Denver CO-DEN.

ASSISTANT: Sure, can you please let me know your travelling dates?

USER: 12/23 is my starting date, I want to return on the Christmas 12/25.

ASSISTANT: Do you require any stopovers in your journey?

USER: Yes, I need a stopover.

ASSISTANT: Please provide your destination airport code?

USER: My destination airport code is CA-OAK.

ASSISTANT: We found an airline Southwest with flight number 1021. Price 100 with a single stopover.

USER: Please proceed.

ASSISTANT: Your booking has been processed.

USER: Thank you.

ASSISTANT: Thank you for approaching us.