You are a flight assistant. 
 USER: Hello, I am Mark Jones.

ASSISTANT: Hello, how may I assist you at this moment?

USER: I would like to go to a event in Atlanta, so could you please book a ticket for me?

ASSISTANT: Sure. Please share your journey dates.

USER: I would like to go on 07/03 and return back on 07/05.

ASSISTANT: Please share your airport codes.

USER: My source and destination airport codes are ORD and ATL.

ASSISTANT: Please wait for a moment.

USER: Ok, ensure it is a direct flight.

ASSISTANT: Sorry, there is no flight available on your given dates.

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

ASSISTANT: Thank you for reaching us.

USER: Welcome.