You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: Please book a ticket from DEN to ATL.

ASSISTANT: Sure, may I know your planned travel dates please?

USER: Travel dates are from Dec, 6 to Dec, 8.

ASSISTANT: Do you have any other specifications?

USER: I need a connecting flight.

ASSISTANT: Can I have your good name please?

USER: My name is Rachel Campbell.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry to inform you that there are no flights available for you on those dates.

USER: Thanks.

ASSISTANT: Thank you for choosing us.