You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Can you please help me to book a flight from LAS to DEN?

ASSISTANT: Sure, please provide your journey dates.

USER: I want to travel on June 23 and need to return on June 25.

ASSISTANT: Do you need any specifications?

USER: I need a flight with single stopover.

ASSISTANT: May I know your name?

USER: John Campbell.

ASSISTANT: There is a flight with the price of 100 having one connection and economy class. Can I proceed to booking?

USER: Ok, please proceed.

ASSISTANT: Your ticket is confirmed in Delta Airlines and flight number is 1015.

USER: Thank you.

ASSISTANT: Thank you for choosing us.