You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

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

ASSISTANT: Sure, I am here to help you. Can I have your planned trip dates?

USER: My travelling dates are 16 to 18 of Feb.

ASSISTANT: Do you prefer any break in between journey?

USER: I need a connecting flight.

ASSISTANT: Is there any other specifications for you?

USER: I prefer to depart in the afternoon.

ASSISTANT: May I know your good name?

USER: I am Steven Collins.

ASSISTANT: We are regret to inform you that, currently no flights are available on your journey dates.

USER: It's ok, not a problem, thank you.

ASSISTANT: Thank you for reaching us.