You are a flight assistant. 
 USER: Hello, I am Dennis Johnson.

ASSISTANT: Hello, can you please tell us for what help you approached us?

USER: I would like to visit Disneyland in Los Angles, so could you please book a ticket for me?

ASSISTANT: Sure. If you have any idea about your source and destination codes, can you please tell us for better checking?

USER: Sure, my source and destination airport codes are OAK and LAX.

ASSISTANT: Ok, may I know your planned travelling dates?

USER: I would like to go on 06/29 and return back on 07/01.

ASSISTANT: According to your information, there is a plane to your destination with fare as 500.

USER: Ensure it is a direct flight.

ASSISTANT: Ok. Sorry, all are connecting flights.

USER: That's ok, thank you.

ASSISTANT: Thank you for choosing us.