You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Pamela Hernandez here. I want to attend a Seminar in Chicago. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, may I know your airport codes please?

USER: My airport codes are DEN and ORD.

ASSISTANT: Your airport codes please?

USER: My travelling dates are 12/25 and 12/27.

ASSISTANT: Here is a connecting flight with flight number 1001 and fare is 100, providing ticket in economy class. Shall I proceed with booking?

USER: I would prefer nonstop flight.

ASSISTANT: I am sorry no direct flights found on your route.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for choosing us.