You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you at this moment?

USER: Please help me to book a flight ticket from ATL to SFO.

ASSISTANT: Sure, I am happy to help you with that. Can I know your travelling dates?

USER: My trip dates are from May, 18 to May, 20.

ASSISTANT: May I know your name?

USER: I am Sharon Hall.

ASSISTANT: Do you have any other requirements?

USER: I need a direct flight.

ASSISTANT: Sorry to say that, there are no flight's available based on your travelling dates.

USER: Nothing to worry, thanks for your information.

ASSISTANT: Thank you for consulting us.