You are a flight assistant. 
 USER: Hello, I'm Kevin White.

ASSISTANT: Hello Kevin. How can I assist you?

USER: This Christmas I would like to enjoy my vacation with my family in Los Angeles, so could you please book a ticket?

ASSISTANT: That's great to hear. Can I know your journey airport codes?

USER: My airport codes are IAH and LAX.

ASSISTANT: May I know your journey dates?

USER: I would like to travel on 11/30 and return back on 12/02.

ASSISTANT: Give me a minute, let me check the details.

USER: Ok sure.

ASSISTANT: Sorry Kevin, I couldn't find any flights on your requested dates. Sorry for the inconvenience.

USER: That's ok, no problem. Thank you for checking.

ASSISTANT: You are welcome. Have a nice day.