You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

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

ASSISTANT: Please provide your travelling dates?

USER: My trip dates are 28 to 30 of Aug.

ASSISTANT: Do you have any preference?

USER: I need a connecting flight and return in the afternoon.

ASSISTANT: May I know your name?

USER: I am Cynthia Thompson.

ASSISTANT: Sorry, there is no flight for your requirement.

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

ASSISTANT: Thank you.