You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: Can you please help me to book flight ticket from AUS to DEN?

ASSISTANT: Sure, let me know your travelling dates.

USER: My trip dates are Sept 9 and Sept 11.

ASSISTANT: Please share your connection limit.

USER: I prefer a connecting flight.

ASSISTANT: Is there any other specifications?

USER: I prefer business class and which departs at afternoon.

ASSISTANT: May I know your name?

USER: Stephanie Carter here.

ASSISTANT: Sorry, there are no flights found based on your details.

USER: It's ok, thank you for checking.

ASSISTANT: Thank you for choosing us.