You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Jonathan Jackson here. I want to alter my reservation as I am sick.

ASSISTANT: Sure, please wait for a moment.

USER: Ok.

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

USER: No problem, thank you.

ASSISTANT: Thank you for approaching us.