You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I assist you?

USER: I want to travel from OAK to SFO. Can you help me to book a flight ticket?

ASSISTANT: Sure, May I know the travelling dates?

USER: I want to fly in the flight on Sept 28 and Sept 30.

ASSISTANT: Do you have any connection limit?

USER: I want to have a connection of 1.

ASSISTANT: Is there any other requirements?

USER: No.

ASSISTANT: May I know your name?

USER: John White.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: That's ok. Anyways, thank you.

ASSISTANT: Thank you for opting us.