You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I support you today?

USER: My name is Catherine Nelson.

ASSISTANT: Ok.

USER: My business meeting was postponed, so please change my existing reservation.

ASSISTANT: Sure, I will help you with that. Please wait a while.

USER: Sure.

ASSISTANT: Thank you for waiting. I have checked in reservation list to change your ticket, but could not find any reservation with your name.

USER: No problem, thank you for your service.

ASSISTANT: Thank you for reaching us, Have a blissful day!.