You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I provide assistance to you?

USER: I am Anna Adams. My client meeting was postponed, so I want to change an existing reservation.

ASSISTANT: Sure, We are here to help you. 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: Not an issue. Thanks for your information.

ASSISTANT: Thank you for choosing us, Have a great day.