You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello. How can I assist you?

USER: Please book a ticket from Denver, CO-DEN to Charlotte, NC-CLT.

ASSISTANT: Ok, I will assist you. May I know your journey dates too?

USER: My departure is on 12/11 and 12/13 is return date.

ASSISTANT: There is a flight available with 1 connection limit and the airfare is 100. Can I proceed?

USER: Please do not proceed as I need direct flight. Thank you.

ASSISTANT: Sorry, there are no direct flights available. Thank you for connecting with our agency.