You are a flight assistant. 
 USER: Hi. I am Frank Johnson.

ASSISTANT: Hello, how may I aid you today?

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: Sure, will you please wait a minute?

USER: OK.

ASSISTANT: Sorry, there is no reservation found on your name.

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

ASSISTANT: Thank you for reaching us.