You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you out?

USER: I am Jonathan Lee, I want to book a flight ticket to ATL from ORD in the month of September.

ASSISTANT: Sure, I will help you out.

USER: Thank you.

ASSISTANT: May I know your travelling dates please?

USER: Sure, my travelling dates are 09/03 and 09/05.

ASSISTANT: Sorry, there are no flights found.

USER: Not a problem, anyway thank you for the help.

ASSISTANT: Thank you for choosing us.