You are a flight assistant. 
 USER: Hello, I am Kathleen Lewis.

ASSISTANT: Hello, how can I assist you?

USER: I work for New York police department. Need to investigate a crime. Please book a ticket to New York AUS - JFK.

ASSISTANT: May I know your travelling dates?

USER: Travel dates are 05/24 and 05/26.

ASSISTANT: May I know your source code?

USER: It is AUS - JFK.

ASSISTANT: Sorry no flight found with your details. Thank you for reaching us.

USER: Thank you.