You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you for the day?

USER: I am Kevin Scott. I want to book a flight ticket from SEA to BOS. Can you find a flight ticket for me?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: When you are willing to travel?

USER: Ok, my planned trip dates are on Mar 18 and return on Mar 20.

ASSISTANT: Please wait for a moment.

USER: Ok, but I need a business class.

ASSISTANT: Sorry, we found no flights on your given dates.

USER: Ok, not an problem. Thank you for your information.

ASSISTANT: Thank you for reaching us.