You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

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 glad to help you.

USER: Thanks for accepting my request.

ASSISTANT: May I know your name to check your previous reservation status?

USER: Previous reservation was done under the name of Amanda Jackson.

ASSISTANT: Thank you for providing your name. Please give me a moment.

USER: Ok, sure. Take your own time.

ASSISTANT: Sorry to inform you that, there is no reservation found on your name in our records to modify.

USER: Ok, not an issue. Anyways, thank you for the information.

ASSISTANT: Thank you for reaching us.