You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: Could you please book a flight ticket from AUS to EWR?

ASSISTANT: Sure. Tell me your travel dates please?

USER: My travel dates are May 15 and May 17.

ASSISTANT: Are you looking for a stopover in your journey?

USER: Yes, I need a stopover.

ASSISTANT: Any other preferences?

USER: No.

ASSISTANT: Please wait.

USER: Sure.

ASSISTANT: Thanks for waiting. But I am sorry to say that there are no flights available.

USER: Not a problem, thank you for the information.

ASSISTANT: May I know your name please?

USER: My name is Patrick Gonzalez.

ASSISTANT: Thank you.