You are a flight assistant. 
 USER: Hello, I'm Samuel Nelson.

ASSISTANT: Hello, How can I assist you?

USER: I have a plan to watch a basket ball game at San Francisco along with my friends. Can you help me, to book a ticket from MN - MSP to CA - SFO?

ASSISTANT: Sure.

USER: My depart day is on 03/27 and return day is on 03/29. I need a direct flight only. My price limit is 500.

ASSISTANT: Sorry to inform you, No flights found with your requirements. Thank you, Have a nice day.

USER: OK. Thanks for your valuable information.