You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I want to book a flight ticket from CLT to LAS. Can you find a flight ticket for me?

ASSISTANT: Sure, let me know your journey dates?

USER: Ok, my travelling dates are on Mar 23 and return on Mar 25.

ASSISTANT: Do you prefer direct flight or connecting flight?

USER: I need a single connecting flight.

ASSISTANT: Is there any other specifications?

USER: I want a business class.

ASSISTANT: May I know your good name?

USER: Ok, I am Barbara Lewis.

ASSISTANT: Thanks for your details, there is no flight found on your desired journey routes.

USER: Ok, not a problem. Thank you for your help.

ASSISTANT: Thank you for availing us.