You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you for the day?

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 here to help you. May I know your name?

USER: Thank you, my name is Donald Clark.

ASSISTANT: Please wait for a moment.

USER: OK.

ASSISTANT: Sorry, we found no reservation on your given name.

USER: Ok, not a problem it is. Thanks for the response.

ASSISTANT: Thank you for reaching us.