You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How can I help you?

USER: Help me in booking a flight from ATL to SFO?

ASSISTANT: Sure, May I know the travelling dates?

USER: My travelling dates are Oct 19 to 21.

ASSISTANT: Do you have any connection limit?

USER: I prefer direct flight.

ASSISTANT: Is there any other requirements?

USER: No.

ASSISTANT: May I know your name?

USER: I am John Thompson.

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

USER: That's ok, thank you.

ASSISTANT: Thank you for opting us.