You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, welcome to flight booking agency. How can I guide you for today?

USER: I am Raymond Anderson. I want to change an existing reservation, due to my business meeting got postponed.

ASSISTANT: Please give me a minute, I will find your existing reservation.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found under your name.

USER: Not an issue. Thanks for your quick response.

ASSISTANT: Thank you for reaching us.