You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you at this moment?

USER: My name is Donna Miller, I want to change my reservation as my plan to visit my friend is postponed. Can you change my reservation?

ASSISTANT: Sure. I will help you. Please wait for a while.

USER: Sure.

ASSISTANT: Sorry, no reservation found on your name in our reservation list.

USER: Thank you for the information.

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