You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Can you please find a flight for my business trip from IAH to LAX?

ASSISTANT: Sure, can you share your journey dates?

USER: My journey dates are from Nov 27 to Nov 29.

ASSISTANT: Do you have any preferences?

USER: I need a business class flight.

ASSISTANT: May I know your name?

USER: Jerry Nelson.

ASSISTANT: Sorry, there is no flight on your given dates.

USER: Oh! That's fine. Thank you for checking.

ASSISTANT: Thank you for opting us.