You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I help you?

USER: I want to travel from OAK to SEA. Can you help me to book a flight ticket?

ASSISTANT: Sure, May I know the travelling dates?

USER: I want to travel in the flight on Feb 15 and Feb 17.

ASSISTANT: Do you have any connection limit?

USER: I want to have a connecting flight.

ASSISTANT: Is there any other requirements?

USER: I prefer business class.

ASSISTANT: May I know your name?

USER: Katherine Baker.

ASSISTANT: Please wait a minute.

USER: Ok, take your time.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: That's ok. Anyways, thank you.

ASSISTANT: Thank you for availing us.