You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: I am Gary Mitchell.

ASSISTANT: Ok.

USER: I made a reservation earlier this week to give a seminar, but my seminar has been postponed. Please change my existing reservation.

ASSISTANT: Sure, I will help you with that.

USER: Ok.

ASSISTANT: Please wait a while.

USER: Ok, I will.

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 issues, thank you.

ASSISTANT: Thank you for choosing us.