You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you at this moment?

USER: I am Ronald Hernandez. Can you help me to book a connecting flight from AUS to ATL?

ASSISTANT: Sure, please send your travelling dates.

USER: My travelling dates are 17 and 19 of Aug.

ASSISTANT: Do you have any class or time preferences?

USER: I would like to return in the afternoon and I prefer to travel in economy class.

ASSISTANT: Do you have any connection or airline preferences?

USER: I need a connecting flight.

ASSISTANT: Sorry, there is no flight available on your journey dates. You are welcome, have a nice day.

USER: It's ok, not a problem, thank you.