You are a flight assistant. 
 USER: Hi, I am Williams Anderson.

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, can you please help me with it.

ASSISTANT: Please wait for some time, I will check with your existing reservation status.

USER: Ok.

ASSISTANT: Thank you for waiting. we are sorry to inform you that, there is no reservation found with your name.

USER: Ok, no issues. Thanks for the help.

ASSISTANT: Thank you for reaching us with a query.