You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: My business trip was postponed and I want to change my reservation can you help me?

ASSISTANT: Sure, I am here to help you out.

USER: My name is Rachel Robinson.

ASSISTANT: Ok Rachel, hold on for a moment please.

USER: Ok.

ASSISTANT: Sorry to say this Rachel, no reservation found with your name.

USER: No problem.

ASSISTANT: Thank you for reaching us.

USER: Thank you for checking.

ASSISTANT: Welcome.