You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Patrick Williams here.

ASSISTANT: How can I aid you right now?

USER: I want to change my reservation due to health issue. Can you help me?

ASSISTANT: Sure, I am beatific to help you. Sorry, there is no reservation with your name to change further.

USER: Ok, no problem. Thank you for checking.

ASSISTANT: My pleasure.