You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Amy Brown here.

ASSISTANT: How may I assist you for the day?

USER: Due to inconvenience of my work, I want to change my reservation. Can you please help me for that?

ASSISTANT: Sure, we are here to help you with this changing reservation.

USER: Thanks for that.

ASSISTANT: Please hold for a while.

USER: Ok, I will wait.

ASSISTANT: Sorry to tell you that, there is no active reservation found with your name in our database to change it.

USER: Anyway, thanks for the information.

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