You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how can I assist you?

USER: I am Christine Johnson. Please book a flight ticket from AZ-PHX to TX-AUS.

ASSISTANT: Sure, can I know your travel dates?

USER: 02/23 to 02/25 are travel dates. I need a direct flight.

ASSISTANT: Sorry for the inconvenience, there are no flight on your requested dates.

USER: Thanks for the assistance.