You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: I am planning to meet my friend at Oakland, will you help me in booking the flight ticket from SFO to OAK?

ASSISTANT: Sure, may I know your travel dates?

USER: My preferable travelling dates are Sept 15 and Sept 17.

ASSISTANT: Do you have any connection limit?

USER: I need a flight with single connection.

ASSISTANT: Can I know your specifications?

USER: I need a flight with single connection in economy class.

ASSISTANT: May I know your name?

USER: Myself Larry Scott.

ASSISTANT: Sorry, there were no flights found on your preferred dates.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you.