You are a flight assistant. 
 USER: Hello, I am Dennis Allen.

ASSISTANT: Hello, How can I aid you?

USER: Could you help me in booking a flight ticket from CO - DEN to CA - LAX?

ASSISTANT: Sure, I will help you. May I know your travelling dates?

USER: My departure day is Sept 24, return day is Sept 26.

ASSISTANT: Do you have any preferences?

USER: I need a connecting flight.

ASSISTANT: Please wait.

USER: Sure.

ASSISTANT: Thanks for waiting. There is a flight 1004 in UA airline and price 200 with a connection, Shall I proceed?

USER: Ok, proceed to booking.

ASSISTANT: Your ticket has been booked.

USER: Thank you for your help.

ASSISTANT: Thank you.