You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Actually my exam is postponed so that I want to change my existing reservation can you help me?

ASSISTANT: Sure, could you please mention your name?

USER: Yes, I am Barbara Jones.

ASSISTANT: Ok, please hold on for a moment.

USER: Ok, sure.

ASSISTANT: Sorry Barbara Jones, there is no reservation found on your name.

USER: Ok, thank you.

ASSISTANT: Thank you, for reaching us.