You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I provide assistance to you?

USER: I already book a flight ticket to visit Seattle in business class but now I found to change my reservation to economy class. Can you change my reservation?

ASSISTANT: Sure, I will help you with that. May I know your good name to check the previous reservation status?

USER: My name is Ruth Williams.

ASSISTANT: Ok, please wait for a couple of minutes.

USER: Sure.

ASSISTANT: Thank you for your precious time. Sorry to say this, there is no active reservation found on your name in the airline database.

USER: Ok, thank you for the details.

ASSISTANT: Thank you for choosing us.