You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I provide assistance to you?

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: Ok.

USER: Can you please help me in change an existing reservation?

ASSISTANT: Sure. I need your name to check reservation.

USER: I made a reservation by this name Kevin Lee.

ASSISTANT: Please, wait for a while.

USER: Ok.

ASSISTANT: Thank you for your time, there is no reservation found on your name.

USER: Ok, not an issue. Thanks for your information.

ASSISTANT: Thank you for approaching us.