You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: My name is Raymond Wilson, I want to book a flight ticket from Oakland to meet my friend.Can you book a return flight in the evening?

ASSISTANT: Sure, can you share your trip dates?

USER: My trip dates are Oct 17 and Oct 19.

ASSISTANT: May I know your journey airport codes?

USER: I will fly from OAK to ORD.

ASSISTANT: Do you need any halt in between your journey?

USER: Yes, I need a halt.

ASSISTANT: Sorry, there is no flight available on your given dates.

USER: Ok, no problem.

ASSISTANT: Thank you for reaching us.