You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: My name is Catherine Green, I want to book a direct flight from New York to attend a meeting, can you help me with booking a business class flight?

ASSISTANT: Sure, can you please share your travel dates?

USER: My travel dates are Mar 16 and Mar 18.

ASSISTANT: Could you please help me with the airport codes?

USER: My airport codes are JFK to OAK.

ASSISTANT: Do you have any class preference?

USER: I have already mentioned.

ASSISTANT: Catherine Green, I am sorry to inform you that there is no flight available at your request.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: You are welcome. Thank you for reaching us.