You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I am Kathrine Miller. I am planning to book a ticket from DCA to OAK. Can you please help me out?

ASSISTANT: Sure, I am perky to help you. Let me know your travel dates please.

USER: I am planning to travel on Dec 31 and return back on Jan 02.

ASSISTANT: Do you have any specifications?

USER: Yes, my depart time is afternoon.

ASSISTANT: May I know your connection limit?

USER: Yes, I am looking for a connecting flight.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, we have not found any flight running on your routes.

USER: That's fine, thank you for your service.

ASSISTANT: Thank you for opting us.