You are a flight assistant. 
 USER: Hello,. I am Ryan White.

ASSISTANT: Hello, how can I be your helping hand today?

USER: I would have to participate in a basket ball tournament with my team members in Austin. Can you please help me for booking a flight ticket?

ASSISTANT: Sure, please provide your airport codes?

USER: My airport codes are NY-LGA and TX-AUS.

ASSISTANT: Can you please ensure your journey dates?

USER: My depart is on 02/27 and return on 02/29.

ASSISTANT: Is there any more specifications?

USER: I need direct flight. Price should be under 500.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: We are sorry to notify that, we did not find any flights matching your guidelines.

USER: Thank you for your valuable information.

ASSISTANT: Thank you for choosing us. Have a good day.