You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you for the day?

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

ASSISTANT: When you are willing to travel?

USER: My travel dates are 07 to 09 of Dec.

ASSISTANT: Do you have any connection limit?

USER: I need a connecting flight.

ASSISTANT: May, I know your good name?

USER: I am Brandon Roberts.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, we found no flights on your given dates.

USER: Oh! that very sad to hear, thank you.

ASSISTANT: Thank you for reaching us.