You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you at this moment?

USER: Please help me out in booking the ticket from AUS to LAX.

ASSISTANT: Sure, I am here to help you. Can you please provide your journey dates?

USER: My trip dates will be July 13 to July 15.

ASSISTANT: Do you have any connection limit preference?

USER: I need a connecting flight.

ASSISTANT: Do you have any other specifications for this trip?

USER: My depart time must be in the evening.

ASSISTANT: May I know your name to proceed further?

USER: William Campbell is my name.

ASSISTANT: William Campbell, there are no flight services available on this route with your preferences.

USER: That's ok, thank you.

ASSISTANT: Thank you for contacting us.