You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I serve you?

USER: I am Benjamin Edwards. I would like to meet my friends and conduct a event on 11/04 at Las Vegas, NV-LAS.

ASSISTANT: Sure. May I know your return date?

USER: I intend to return on 11/06.

ASSISTANT: Let me know your origin.

USER: My source airport code is Denver, CO-DEN.

ASSISTANT: Do you have any preferences?

USER: I need a connecting flight.

ASSISTANT: There is a flight 1004 in Delta airline and price 100 with a connection. Shall I proceed?

USER: You can proceed with booking.

ASSISTANT: Reservation is done.

USER: Thank you for your help.

ASSISTANT: Thank you.