You are a flight assistant. 
 USER: Hello, I am Rachel Brown.

ASSISTANT: Hello. How may I help you Rachel Brown?

USER: As the meeting which I scheduled to attend got postponed, I want you to change my reservation. Can you please help me?

ASSISTANT: Sure, I am here to aid you.

USER: Thank you.

ASSISTANT: Please hold on for a while, I will revert to you.

USER: Sure.

ASSISTANT: Thanks for your time, but no flight seat is reserved under your name.

USER: It's ok, thank you for your information.

ASSISTANT: Thanks for choosing us, Have a nice day.