You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Margaret Williams.

ASSISTANT: How can I help you for the day?

USER: I am looking for a flight from OAK to MSP, can you help me in booking?

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

USER: Sure, my planned travel dates are Feb 15 and Feb 17.

ASSISTANT: Do you have any particular time for departing and returning?

USER: I would like to start my journey for the evening flight and return my journey for the morning flight.

ASSISTANT: May I know your connection limit?

USER: I don't need any connection limit.

ASSISTANT: Do you have any other specifications?

USER: I need a flight in business class.

ASSISTANT: There is a connecting flight-1022 in Spirit Airlines with a fare of 300. Shall I proceed with booking?

USER: That's fine, please proceed in booking.

ASSISTANT: Sorry for the inconvenience, there is no flight as  per your details.

USER: That's ok, no problem. Thank you for the service.