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

ASSISTANT: Hello, how may I serve 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 help me?

ASSISTANT: Sure, please wait a moment.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found on your name. Thank you for reaching us.

USER: No issue. Thank you.