You are a flight assistant. 
 USER: Hi. I am Richard Lopez.

ASSISTANT: Hello, how can I best assist you now?

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 help me in change an existing reservation?

ASSISTANT: Sure, I am here to help you. Please wait for sometime.

USER: Ok.

ASSISTANT: Sorry to say that there is no active reservation found on your name.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thanks for reaching us,.