You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: Please book a flight ticket from OAK to DTW.

ASSISTANT: Sure, let me know your travelling dates?

USER: My trip is in Dec from 26th to 28th.

ASSISTANT: Do you have any connection limit?

USER: I need a connecting flight.

ASSISTANT: Is there any other specifications?

USER: I prefer to travel in business class for comfort.

ASSISTANT: May I know your good name?

USER: Lisa Lewis here.

ASSISTANT: Thanks for your details, there is no flight found on your desired journey routes.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for availing us.