You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

USER: Please help me to book a flight ticket from ATL to IAH.

ASSISTANT: Can you provide your trip dates?

USER: My planned trip dates are Sept, 17 and Sept, 19.

ASSISTANT: Do you need any connection limit?

USER: I need direct flight.

ASSISTANT: Do you have any other specifications?

USER: I would prefer to fly with normal cost airlines only.

ASSISTANT: May I know your name?

USER: Nicholas Campbell.

ASSISTANT: Sorry, there are no flights available on your routes.

USER: That's ok, thank you for the information.

ASSISTANT: Thank you for choosing us.