You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How can I serve you?

USER: Can you book a flight ticket from AUS to JFK?

ASSISTANT: Sure, May I know the travelling dates?

USER: My trip is in Jan from 19th to 21st.

ASSISTANT: Do you have any connection limit?

USER: Yes, I prefer a connecting flight to travel.

ASSISTANT: Is there any other requirements?

USER: No, thanks for asking.

ASSISTANT: May I know your name?

USER: I am William Collins.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: That's ok, thank you for the information.

ASSISTANT: Thank you for opting us.