You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I am looking for a direct flight for my business trip to Denver. Can you book  the flight ticket?

ASSISTANT: May I know your travel specifications and I am glad to help you.

USER: I do not have any preferences.

ASSISTANT: May I know your travel dates please?

USER: The travel dates are from Dec 27 to Dec 29.

ASSISTANT: May I know your name to proceed for booking?

USER: I am Amanda Carter.

ASSISTANT: Please share your destination airport code.

USER: My airport codes are from MSP to DEN.

ASSISTANT: Is there any other concern of your specifications?

USER: No.

ASSISTANT: Sorry, no flights found as per your preferences at the moment on this route.

USER: Not a problem. Thank you.

ASSISTANT: Thank you for choosing us.