You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may 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 will try to help you to change that reservation but I need your name to check in the reservation list.

USER: Linda Collins is my name.

ASSISTANT: Sorry, we tried hard to find out your reservation in our database with your name but I could not find any reservation with your name.

USER: That's ok, thank you for informing.

ASSISTANT: My pleasure.