You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I want to book a ticket from Oakland to New York.

ASSISTANT: Sure, I am happy to help you. Can you please let me know your travelling dates?

USER: Travelling dates are from Nov, 26 to Nov, 28.

ASSISTANT: Kindly mention your destination airport code.

USER: Airport codes are OAK and LGA.

ASSISTANT: Do you prefer any stopover in between journey?

USER: I prefer connecting flight.

ASSISTANT: Are there any other specifications for you?

USER: I would like to travel in business class.

ASSISTANT: Can I have your good name?

USER: Dennis Johnson.

ASSISTANT: Sorry, no flights are available on your journey routes.

USER: Thanks.

ASSISTANT: Thank you for choosing us.