You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I need a business class flight to DCA from LAS to meet my friend. Can you assist me in booking a flight ticket?

ASSISTANT: Sure, can you please share your travelling dates?

USER: Ok, my travelling dates are Nov 12 and Nov 14.

ASSISTANT: Do you have any limits on number of connections?

USER: I need a connecting flight for my journey.

ASSISTANT: Is there any class preference?

USER: I have provided you above.

ASSISTANT: Do you have any other requirements?

USER: No.

ASSISTANT: May I know your name?

USER: Ok, Nicholas White.

ASSISTANT: Sorry, there are no flights found based on your details.

USER: Not a problem, anyways thank you for the information.

ASSISTANT: Thank you for choosing us.