You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Kimberly Collins.

ASSISTANT: How can I assist you?

USER: I am planning to attend convocation meeting at DCA, can you please help me with booking a flight ticket from OAK?

ASSISTANT: Sure, can I know the travel dates please?

USER: Sure, I would like to take off on Jan 19 and return on Jan 21.

ASSISTANT: Do you have any connection limit?

USER: I need a flight with 1 connection.

ASSISTANT: May I know the departure and return time please?

USER: Sorry,I need a flight with 0 connection. I would like to depart during afternoon time.

ASSISTANT: Ok, wait a moment please.

USER: Sure.

ASSISTANT: Sorry, there are no flights available as per your request.

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

ASSISTANT: Thank you for approaching us.

USER: You are welcome.