You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I serve you today?

USER: In Houston, TX - HOU climate was very beautiful to see. So I would like to visit once. Can you book a flight ticket?

ASSISTANT: Sure, To book a flight I need your journey dates and origin point.

USER: I will start from Los Angeles, CA - LAX on 02/26 and return on 02/28.

ASSISTANT: Ok, Give me a minute.

USER: Sure.

ASSISTANT: Thanks for waiting. Sorry, we do  not found any flight that matches your requirements.

USER: Ok, no issue. I will check another option.

ASSISTANT: May I know your name please?

USER: Margaret Jackson is my name.

ASSISTANT: Ok, Thanks for choosing us.

USER: Thanks for your information.