You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself James Baker.

ASSISTANT: How can I aid you at this moment?

USER: I am planning to visit Oakland, will you help me in booking the flight ticket from DFW?

ASSISTANT: Sure, I will help you with this. Could you please share your journey dates?

USER: My preferable journey dates are Nov 20 and Nov 22.

ASSISTANT: Do you have any specifications for this trip?

USER: Please make sure that I want to return in afternoon time.

ASSISTANT: Wait a moment please.

USER: I need a halt in between my journey.

ASSISTANT: James Baker, there are no flight services available with your preferences on this route.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for contacting us.