You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

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

ASSISTANT: Can I have your journey dates?

USER: My travel dates are 21 and 23 of June.

ASSISTANT: Do you have any specifications?

USER: I need a connecting flight.

ASSISTANT: May I know your name?

USER: I am Jonathan Jones.

ASSISTANT: There are no flights available on your routes.

USER: Oh! that very sad to hear, thank you.

ASSISTANT: Thank you for choosing us.