You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Can you please help me in booking a flight ticket from Washington, IAD to reach Denver, DEN?

ASSISTANT: Can you please share your planned trip dates?

USER: My journey dates are from Dec 03 to Dec 05.

ASSISTANT: Do you have any connection limit?

USER: I need a break in between journey.

ASSISTANT: Is there any class preference?

USER: I prefer business class flight.

ASSISTANT: May I know your arrival and depart timings?

USER: My return time is evening.

ASSISTANT: Do you have any other specifications?

USER: No, thanks for asking.

ASSISTANT: May I know your good name to proceed further?

USER: My name is Brenda Brown.

ASSISTANT: Please be on hold.

USER: Sure.

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

USER: Ok, that's not a problem. Thanks for your information.

ASSISTANT: Thank you for choosing us.