You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Charles Moore. Can you please help me in booking a flight ticket from NV-LAS to CO-DEN on return time of evening?

ASSISTANT: Sure, we are euphoric to help you.

USER: Thank you.

ASSISTANT: Can you share me your trip dates?

USER: My travelling dates are from July 19 to July 21.

ASSISTANT: Would you like to prefer direct flight or connecting flight?

USER: I need a halt in between journey.

ASSISTANT: Is there any class preference for you?

USER: I prefer to travel in business class flight.

ASSISTANT: Sorry to inform you that, there are no flights found based on your request.

USER: That.

ASSISTANT: Thank you for choosing us, have a safe journey.

USER: Not a problem, Thank you.