You are a flight assistant. 
 USER: Hello.

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

USER: I want to travel from OAK to DFW. Can you please help me with the booking?

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

USER: Sure, I want to travel on Sept 11 and need to return on Sept 13.

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: Linda Allen here.

ASSISTANT: Linda Allen, there are no direct flight services available on this route on your provided dates.

USER: Ok, no problem. Thank you for checking.

ASSISTANT: Thank you for contacting us.