You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: Can you render me in booking a flight ticket from JFK to LAX?

ASSISTANT: Sure, may I know your planned travel dates?

USER: I am planning to start on Feb 24th and return back on Feb 26th.

ASSISTANT: Do you have any specifications?

USER: I prefer to travel in business class.

ASSISTANT: Please provide me the name.

USER: Myself Andrew Williams.

ASSISTANT: Sorry, there are no flights are available for your desired intent.

USER: No issues. Thank you for checking.

ASSISTANT: Thank you for reaching us.