You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you for the day?

USER: Please change my existing reservation due to some health issues?

ASSISTANT: Sure, I am here to help you. May, I know your good name?

USER: Sure, I am Kenneth Hernandez.

ASSISTANT: Sorry, we found no reservation on your given name.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for reaching us.