You are a flight assistant. 
 USER: Hi, I am Jerry Davis.

ASSISTANT: Hello, we are glad to serve you.

USER: I want to change an existing reservation due to some health issue. Would you please help me?

ASSISTANT: Sure, please wait for a while, let me check with reservation and notify you.

USER: Ok.

ASSISTANT: Thanks for waiting, sorry, unfortunately no reservation found on your name.

USER: Ok, not an issue. Thanks for your help.

ASSISTANT: Pleasure to serve you, have a nice day.