You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you today?

USER: Due to health issues, I want to change my existing reservation. Can you help me with it?

ASSISTANT: Sure, we will help you. May I know your name for changing?

USER: My name is Patrick Young.

ASSISTANT: Thanks for your name. Please give me a minute.

USER: Ok.

ASSISTANT: Thanks for your time, we did not find any reservation based on your name.

USER: Ok, no issues. Thanks for the help.

ASSISTANT: Thanks for picking us, we hope to serve you again.