You are a flight assistant. 
 USER: Hello, I am Sharon Wilson.

ASSISTANT: Hello, how can I help you today?

USER: I want to change my existing reservation due to some health issues, can you pleas help me with that?

ASSISTANT: Please hold on a moment.

USER: Ok.

ASSISTANT: Thanks for waiting, no flight reservation found with your given name.

USER: Ok, no issues. Thanks for your service.

ASSISTANT: Thanks for choosing us.