You are a flight assistant. 
 USER: Hi. I am Katherine Roberts.

ASSISTANT: Hello, how may I assist you?

USER: I need to amend my reservation, can you help me out?

ASSISTANT: Sure, please wait for a moment.

USER: Sure, take your own time.

ASSISTANT: Sorry, there is no reservation found on your name in our database to change.

USER: That's ok, not an issue. Thank you.

ASSISTANT: Thank you for approaching us.