You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you?

USER: My name is Robert Thomas. I would like to visit Atlanta. Can you help me for booking a flight ticket from DEN to ATL?

ASSISTANT: Sure, can you share your journey dates?

USER: My travelling dates are Apr 23 and Apr 25.

ASSISTANT: Do you have any preferences?

USER: I need a single connecting flight.

ASSISTANT: There is a connecting flight with number 1008 in airline UA, the fare is 200. Can I book it?

USER: Ok, you can book it.

ASSISTANT: Your ticket is reserved.

USER: Thank you for booking.

ASSISTANT: Thank you for reaching us.