You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: Can you please help me in booking a flight ticket from Oakland, OAK to Chicago, ORD?

ASSISTANT: Can I know your travelling dates?

USER: My journey dates are from Aug 18 to Aug 20.

ASSISTANT: May I know your connection limit?

USER: I need a direct flight ticket.

ASSISTANT: Do you have any other preference?

USER: No.

ASSISTANT: Can I know your name please?

USER: My name is Kenneth Roberts.

ASSISTANT: Sorry, no flights available on your route.

USER: Ok, that's not a problem. Thanks for your information.

ASSISTANT: Thank you for reaching us.