You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Patrick Parker here.

ASSISTANT: How can I assist you at this moment?

USER: Can you please help me out in booking the ticket from DFW to ATL?

ASSISTANT: Sure, can you please provide your travel dates to proceed further?

USER: Sure, my travel dates are 04/07 and 04/09.

ASSISTANT: Wait a moment please.

USER: Sure, I'll wait.

ASSISTANT: Patrick Parker, there are no flight services available on this route on your requested dates.

USER: That's ok, thank you for giving the information.

ASSISTANT: Thank you for contacing us.