You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: My name is Jonathan Lewis, I already make a reservation and I got a business class flight ticket. Can you change my reservation so I can get economy class?

ASSISTANT: Sure, I am here to help you. Please wait for a while, I will check and get back to you.

USER: Sure, I will wait for your reply.

ASSISTANT: Sorry, no reservation found on your given name.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for choosing us.