You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you now?

USER: I need to book a ticket from OAK to ORD. Could you book a ticket?

ASSISTANT: Sure, I am glad to help you with that. Can you please provide your preferable travelling dates?

USER: Travelling dates are Jan, 26 and Jan, 28.

ASSISTANT: Any class preference do you have?

USER: I prefer to travel in business class.

ASSISTANT: Do you have any connection limit?

USER: I need connecting flight.

ASSISTANT: May I know your name please?

USER: My name is Nicole White.

ASSISTANT: Please wait a moment to check the flights.

USER: Sure.

ASSISTANT: Unfortunately there are no flights running on your route with your required preferences.

USER: Thank you.

ASSISTANT: Thank you for reaching us, have a great day.