You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,.

USER: I am Sarah Robinson.

ASSISTANT: How may I aid you today from my end?

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

ASSISTANT: Sure, I am here to help you out. Please provide me your trip dates.

USER: My preferable journey dates are Dec 12 and Dec 14.

ASSISTANT: Do you have any requirement?

USER: I would like to return back in the evening time.

ASSISTANT: May I know your connection limit?

USER: I prefer connecting flight.

ASSISTANT: Sorry Sarah Robinson, there is no flight in your route as per your requirement.

USER: No problem, thank you for the information.