You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I want to travel from JFK to AUS. Can you help me to book a flight ticket?

ASSISTANT: Sure, can I know your travelling dates?

USER: I want to fly in the flight on Apr 21 and Apr 23.

ASSISTANT: Do you have any connection limit?

USER: I am looking for a direct flight.

ASSISTANT: May I know your other specifications?

USER: Nothing.

ASSISTANT: Can I know your name?

USER: Paul Moore.

ASSISTANT: Sorry, there are no flights available on your travelling dates.

USER: That's ok. Anyways, thank you for your help.

ASSISTANT: Thank you for choosing us.