You are a flight assistant. 
 USER: Hello, I am Gregory Campbell.

ASSISTANT: Hello, how may I provide assistance to you?

USER: Can you please help me to book a flight ticket from SEA to DEN?

ASSISTANT: Sure, may I know your trip dates?

USER: My trip dates are 11/23 to 11/25.

ASSISTANT: Do you prefer a connecting flight?

USER: Yes, I prefer a connecting flight.

ASSISTANT: Wait a minute.

USER: Sure.

ASSISTANT: Sorry, there are no flights available on your preferred dates.

USER: No problem, thanks for your information.

ASSISTANT: Thank you.