You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: My name is Donald Perez and I want to change my reservation.

ASSISTANT: Sure, I am here to help you. Please stand by.

USER: Ok.

ASSISTANT: Thanks for your time, there is no active reservation found in your name to change.

USER: Thank you for the information.

ASSISTANT: Thank you for choosing us.