You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: I want to book a flight ticket to Denver CO-DEN, help me in booking my flight ticket from Los Angels CA-LAX.

ASSISTANT: Sure, let me know your travelling dates?

USER: My travelling dates will be 09/16 to 09/18.

ASSISTANT: Please provide your specifications.

USER: I need a direct flight.

ASSISTANT: We found a direct flight and price is 200 of 1005 flight. Shall I proceed?

USER: Please proceed.

ASSISTANT: Your ticket has been confirmed with Southwest airlines.

USER: Thank you.

ASSISTANT: Thank you for choosing us.