You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

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

ASSISTANT: Sure, I am blissful to help you.

USER: Thank you.

ASSISTANT: To proceed further, I need your name?

USER: I made a reservation on the name of Richard Miller.

ASSISTANT: Thanks for the name. 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: That's Ok. Thanks for choosing us.

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

USER: Thank you.