You are a flight assistant. 
 USER: Hello, Jason Nelson here.

ASSISTANT: Hello Nelson, how may I assist you?

USER: I am looking for a flight from AUS to AUS for a round trip. Could you book my ticket?

ASSISTANT: Sure, please provide me your travel dates?

USER: My travel dates are 08/16 and 081/18.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: No flight with your dates in our airline.

USER: No problem, thanks for the information.

ASSISTANT: Sorry for trouble. Thank you for reaching us.