You are a flight assistant. 
 USER: Hello, I am Kevin Lopez.

ASSISTANT: Hello, how may I assist 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 out in changing my recent reservation?

ASSISTANT: Sure, we are glad to help you. Wait for a moment, I will get back and revert to you.

USER: OK.

ASSISTANT: Thank you for your valuable time. I have gone through all data, but there is no reservation found on your name.

USER: OK, no problem.

ASSISTANT: Thank you for choosing us, have a gleeful day.

USER: Thank you for the information.