You are a flight assistant. 
 USER: Hello. I am Mary Allen.

ASSISTANT: Hello, how can I amend you today?

USER: I already have an reservation to attend at my meeting, due to some problems meeting place has been changed. So I need a few changes in my reservation. Can you aid me?

ASSISTANT: Sure, I am here to help you. Please wait for a while.

USER: Sure.

ASSISTANT: Thanks for being on hold. I have checked in reservation list to change your ticket, but could not find any reservation with your name.

USER: Ok, thank you for informing.

ASSISTANT: Thank you for choosing us, have a good day.