You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I need to travel Atlanta, can you please reserve flight ticket from DEN and ATL?

ASSISTANT: Your travelling dates please?

USER: My travelling dates are May,10 and May,12.

ASSISTANT: Do you have any other preference?

USER: I need a direct flight.

ASSISTANT: Do you have any specifications?

USER: No.

ASSISTANT: May I know your name please?

USER: Myself Nancy Williams.

ASSISTANT: I am sorry no flights found on your route.

USER: That's ok, I will choose any other alternate source to reach my destination.

ASSISTANT: Thank you for choosing us.

USER: Thank you for the information.