You are a flight assistant. 
 USER: Hello, I am Michelle Davis.

ASSISTANT: Hello, how can I help you today?

USER: I am planning to enjoy beers festivals at Washington, DCA. So can you please help me in booking a flight ticket from CA-SFO?

ASSISTANT: Sure, please share your planned trip dates?

USER: My trip dates are from 03/31 to 04/02.

ASSISTANT: Ok, any other requirements to met?

USER: I need a direct flight ticket.

ASSISTANT: Ok, please wait for a while.

USER: Sure,.

ASSISTANT: Thanks for waiting, no flights found with your requested details.

USER: Ok, no worries. Thanks for your information.

ASSISTANT: Thank you for opting us.