You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you at this moment?

USER: I would like to book a flight from AUS to DEN, can you please help me to book a flight ticket?

ASSISTANT: Sure, I am here to help you. Can you please provide your journey dates?

USER: Sure, my journey dates are Sept 07 and Sept 09.

ASSISTANT: Do you have any connection limit preference for this trip?

USER: I need a connecting flight.

ASSISTANT: May I know your class preference?

USER: I am comfortable to travel in any class.

ASSISTANT: Do you have any other specifications for this trip?

USER: No.

ASSISTANT: May I know your good name please?

USER: My name is Carol Parker.

ASSISTANT: Carol Parker, there are no flight services are available on this route on your provided dates.

USER: No problem, thank you for your information.

ASSISTANT: Thank you for contacting us.