You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I support you today?

USER: I am Pamela Lewis. I need to change my reservation as my meeting got postponed, can you please help me out?

ASSISTANT: Sure, we are happy to help you. Please wait for a while.

USER: Ok.

ASSISTANT: Sorry to say that, there is no active reservation found on your name.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for availing us.