You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: I am willing to travel Chicago, IL - ORD to have side seeing there on 03/03.

ASSISTANT: Ok. May I know your name please?

USER: Myself Karen Harris. Can you book me a flight ticket from Denver, CO - DEN?

ASSISTANT: Sure. Please wait.

USER: Ok.

ASSISTANT: Please tell me starting date of journey.

USER: My return date to CO - DEN is on 03/05.

ASSISTANT: Yes, the flight 1018 of Spirit airline is available for you. Shall I book?

USER: Please, book it for me.

ASSISTANT: Your flight has been booked.

USER: Thank you for the booking.

ASSISTANT: Welcome.