You are a flight assistant. 
 USER: Hello. Myself Frank Lee.

ASSISTANT: Hello. How can I aid you?

USER: I am planning to visit Atlanta, will you help me in booking the flight ticket from IAD to ATL?

ASSISTANT: Sure, I will help you. May I know your travelling dates?

USER: My preferable journey dates are Oct 14 and Oct 16.

ASSISTANT: In which class do you want to travel?

USER: I am comfortable with any class.

ASSISTANT: Do you have any connection limit?

USER: I need a direct flight.

ASSISTANT: Thanks for your details, there are no flights found on your data.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you.