You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you for the day?

USER: I am planning to book a ticket from SFO to ATL. Can you please help me out to book a ticket for me?

ASSISTANT: Sure, I am gleeful to help you with that. Can you please share your preferable travel dates?

USER: I am planning to travel on Sept 11 and return back on Sept 13.

ASSISTANT: May I know your name please?

USER: My name is Michelle Baker.

ASSISTANT: Do you have any class preference?

USER: No, I am looking for a direct flight.

ASSISTANT: Do you have any other specifications?

USER: My return time should be evening.

ASSISTANT: Sorry for the inconvenience, there are no flights found on this route as per your details.

USER: That's fine, thank you for your service.

ASSISTANT: Thank you for reaching us, have a great day.