You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Kenneth Perez, I want to change my reservation as my plan to visit my friend's house is postponed. Can you change my reservation?

ASSISTANT: Sure, please wait a moment.

USER: Sure.

ASSISTANT: Sorry there is no reservation on your name.

USER: Ok, thank you for the information.

ASSISTANT: Thank you.