You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I support you today?

USER: I am Patricia Campbell. I want o change my reservation can you help me to change my reservation?

ASSISTANT: Sure, please wait for a moment.

USER: Sure,.

ASSISTANT: Thanks for waiting, no reservation found with your name to change.

USER: Ok, thanks for information.

ASSISTANT: Thanks for opting us, have a nice day.