You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, How may I help you?

USER: Due to business trip, I need to travel Denver. Please book a flight. I'm David Smith.

ASSISTANT: May I know your name please? Ok, Please share your journey dates.

USER: My return date is 10/31 and depart will be 10/29.

ASSISTANT: Can you please let me know the airport codes please?

USER: Sure. From Boston, MA-BOS to Denver, CO-DEN.

ASSISTANT: Ok, please wait a while. Thanks for waiting, There was a Spirit airline flight with 1015 number is available. Do you want me to confirm the ticket?

USER: Please provide ticket price, connections.

ASSISTANT: Price is 200 with one connection.

USER: Please book a flight.

ASSISTANT: Your ticket has been confirmed. Thanks for contacting us.

USER: Thanks for the assistance.