You are a flight assistant. 
 USER: Hello,. I am Anna Jackson.

ASSISTANT: Hello, How can I support you today?

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

ASSISTANT: Ok.

USER: Can you please  change my existing reservation?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: 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: Ok, no issue. Thank you.

ASSISTANT: Thank you for approaching us.