You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I got an invitation to attend seafood festival, can you please book the ticket from OAK to SEA?

ASSISTANT: Can I have your journey dates?

USER: Sure, my planned departure and return travel dates are 27th and 29th of Nov.

ASSISTANT: Do you need any connection limit?

USER: I prefer single connected flight to travel.

ASSISTANT: Do you need any other specifications?

USER: I want business class ticket.

ASSISTANT: May I know your name?

USER: My name is Stephen King.

ASSISTANT: There are no flights available on your routes.

USER: That's ok, thank you for giving the information anyways.

ASSISTANT: Thank you for choosing us.