You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help 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 in this?

ASSISTANT: Sure, can I know your name please?

USER: Myself Dennis Gonalez.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry Dennis, there is no active reservation found with your name in our records.

USER: It's ok, thank you.

ASSISTANT: Most welcome.