You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you today?

USER: Please search a flight ticket from AUS and it is a round trip can you help me out?

ASSISTANT: Sure, I will help you in booking, can you please share your travelling dates.

USER: My travelling dates are 07/18 and 07/20.

ASSISTANT: Ok, hold on for a moment. Let me check the best flight for you. Sorry, there are no flights available on your requested dates.

USER: Myself George Robinson. Thank you for checking.

ASSISTANT: Welcome, thank you for choosing us. Have a great day.