You are a flight assistant. 
 USER: Hello. I am Steven Evans.

ASSISTANT: Hello, how can I help you today?

USER: Can you please help me in booking a flight ticket from DEN to AUS?

ASSISTANT: Sure, may I know your planned travel dates?

USER: My planned journey dates are Aug 23 and Aug 25.

ASSISTANT: Is there any class preference for you?

USER: I am comfortable with any class.

ASSISTANT: Do you have any specifications?

USER: My return time should be afternoon.

ASSISTANT: May I know your connection limit?

USER: I need a flight with single connection.

ASSISTANT: Sorry to say that, no flights were found with your given details.

USER: Ok, no  problem. Thank you for the information.

ASSISTANT: Thank you for reaching us.