You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

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

ASSISTANT: Sure, may I know your planned travel dates please?

USER: Thank you. I have planned my travel dates as July 15 and July 17.

ASSISTANT: Do you have any other specifications?

USER: I would like to depart in evening time so please make sure that.

ASSISTANT: Would you like to travel in a direct flight or a connecting flight?

USER: I am ok with any flight. I am not particular about anything.

ASSISTANT: May I know your good name please?

USER: Sure, myself Patrick Walker.

ASSISTANT: Sorry, there is no flight available in this route.

USER: Oh! It is sad to hear. Anyway, thank you for your time.

ASSISTANT: You are welcome.