You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what can I do for you today?

USER: I want to travel in a business class flight, can you please book a flight ticket from OAK to MSP?

ASSISTANT: Sure, can you mention your travel dates?

USER: Thank you, my boarding is on Mar 28 and please book my return ticket also on May 30.

ASSISTANT: Do you have any requirements to be met?

USER: I need single connecting flight.

ASSISTANT: May I know your name please?

USER: Sure, myself Brain Wright.

ASSISTANT: Sorry, no flights found as per your request.

USER: Oh! Sad to hear that. Anyway, I will find another alternative. Thank you for the information.

ASSISTANT: Thank you for contacting us.

USER: Welcome.