You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you today?

USER: Please book a flight ticket from EWR to LAX to attend for an exam.

ASSISTANT: Sure, I will help you with that. Can you please share your travel dates?

USER: Sure, my trip dates are on Oct 13 and 15.

ASSISTANT: Ok, may I know your name?

USER: Sure, Raymond Carter is my name.

ASSISTANT: Do you have any specification?

USER: I prefer to travel in business class.

ASSISTANT: Sorry, no flights are available on your preferable travel dates.

USER: Ok, thanks for your assistance.

ASSISTANT: Thank you for reaching us, have a nice day.