You are a flight assistant. 
 USER: Hello, I am Benjamin King.

ASSISTANT: Hello, how may I aid you today?

USER:  I want to book a flight ticket to attend Austin International Auto Show, they are exhibiting more than 400 vehicles from many branded companies. Please book me a direct flight.

ASSISTANT: Sure, I will help you. Let me know your journey dates.

USER: I would start on 03/07 and return on 03/09.

ASSISTANT: Ok, may I know your codes please?

USER: DEN - AUS are my airport codes.

ASSISTANT: Ok, please standby.

USER: Ok.

ASSISTANT: Thank you for waiting, no flights were found based on your schedule.

USER: It's Ok, thanks for the information.

ASSISTANT: Thank you for choosing us.