You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today from my end?

USER: I made a earlier reservation to attend a  conference, due to some political issues it got postponed. Can you please help with changing my  reservation?

ASSISTANT: Sure, I am here to help you out. Please provide me your name to amend it.

USER: Thank you. And my name is Rachel Carter.

ASSISTANT: Sorry Rachel Carter, there is no reservation in our database.

USER: Ok, no issue. Thank you.

ASSISTANT: Thank you for reaching us.