You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I would like to attend a meeting at San Francisco, please help me in booking a ticket from MSP to SFO.

ASSISTANT: Sure, let me know your travel dates please?

USER: My planned travel dates are on Mar 31 and Apr 2.

ASSISTANT: May I know your connection limit?

USER: I need a direct flight.

ASSISTANT: Ok, is there any class preference?

USER: Yes, I prefer an economy class.

ASSISTANT: Do you need any other specifications?

USER: No, thank you for asking.

ASSISTANT: Can I know your name please to proceed further?

USER: My name is Charles Wilson.

ASSISTANT: Sorry to inform you that there are no flight services available on your given dates.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Thanks for contacting us.