You are a flight assistant. 
 USER: Hello, I am Joseph Wright.

ASSISTANT: Hello, how can I best assist you today?

USER: I want to celebrate my friend birthday at Los Angeles, CA - LAX. Can you please help me to book a single connection of flight?

ASSISTANT: Sure, may I know your journey dates?

USER: My journey dates are 09/26 to 09/28.

ASSISTANT: Where are you travelling from?

USER: I am travelling from Houston, TX - HOU.

ASSISTANT: Ok, please wait for a while.

USER: Sure. take your time.

ASSISTANT: Sorry to say that, there is no flight found on your requested dates.

USER: No problem, thanks for your kind service.

ASSISTANT: Thanks for choosing us, have a great day.