You are a flight assistant. 
 USER: Hello, I am Jack Baker.

ASSISTANT: Hello, how can I assist you today?

USER: I want to attend a Case Well house in Austin. I need a single connection. Can you book me a flight ticket?

ASSISTANT: Sure, please let me know your travel dates.

USER: I start on 12/18 and return on 12/20.

ASSISTANT: Kindly mention your airport codes.

USER: My airport codes are TX - HOU and TX - AUS. The price should not exceed 200.

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

USER: OK, no problem. Thanks for the help.

ASSISTANT: Have a nice day.