You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Can you please help me in booking the flight ticket from DEN to ATL?

ASSISTANT: Sure, could you please help me with your name?

USER: My name is Benjamin Phillips.

ASSISTANT: Thank you. May I know your travel dates?

USER: My travel dates are Oct 13th and 15th.

ASSISTANT: Ok, do you have any class preference?

USER: I am comfortable with any class.

ASSISTANT: Ok, is there any other requirements?

USER: I need a direct flight.

ASSISTANT: Benjamin Phillips, there is no direct flight available on your preferred travel dates.

USER: Ok, thank you for the information.

ASSISTANT: You are welcome and have a nice day.