You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I am Stephan Scott, I need to change my reservation as my schedule got postponed.

ASSISTANT: Sure, I will help you about your reservation changing.

USER: Thank you.

ASSISTANT: Sorry to say this Scott, there are no active reservation under your name to change.

USER: It's ok, anyway thank you for the help.

ASSISTANT: You are most welcome, thank you for reaching out here.