You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello. How can I help you with?

USER: Please book a ticket to Denver, CO - DEN, As I want to visit 16th Street Mall with my friends.

ASSISTANT: Sure.

USER: Thank you.

ASSISTANT: Please send your travelling dates, when are you planning to go?

USER: I planned to fly on 12/18, and I need to return on 12/20.

ASSISTANT: Can you please share the departure place.

USER: MN - MSP, Minneapolis & St. Paul.

ASSISTANT: Do you need a stop over or not?

USER: Yes, I need one.

ASSISTANT: May I know your name to proceed further?

USER: Ronald Garcia, is my name.

ASSISTANT: Thanks for sharing details, but no connecting flights available on respective routes.

USER: Ok, no problem. i will takeoff with another airline.

ASSISTANT: Thank you, Have a nice day.

USER: Thank you for your quick reponse.