You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

USER: Can you help me to book a flight ticket from ATL to DFW?

ASSISTANT: Sure, I am here to help you. Can you please provide your journey dates?

USER: I want to take off on 10 June and return on 12 June.

ASSISTANT: Do you have any connection limit preference?

USER: I need a direct flight.

ASSISTANT: Do you have any other specifications for this trip?

USER: No.

ASSISTANT: May I know your name to proceed further?

USER: I am Ronald Campbell.

ASSISTANT: Ronald Campbell, there are no flight services available on this route on your provided dates.

USER: It's ok, not a problem, thank you.

ASSISTANT: Thank you for contacting us.