You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Amanda Brown here.

ASSISTANT: Ok.

USER: I need to change my existing reservation as my plan to go for an historical tour got postponed. Can you please check if my reservation is active or not? If it is active, please change it.

ASSISTANT: Sure, I am here to help you. Please wait a minute.

USER: Thank you.

ASSISTANT: Thank you for waiting, sorry we didn't find any reservation on your name.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for opting us, have a good day.