You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I support you?

USER: I am Brian Taylor, I want to change my reservation due to sudden health issue. Can you change my reservation?

ASSISTANT: Sure, please wait for a minute.

USER: Sure.

ASSISTANT: Unfortunately, there is no reservation found with your name.

USER: Thank you for your information.

ASSISTANT: Thank you for availing us.