You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I am Anthony Campbell. I want to change my reservation due to health problem, can you help me?

ASSISTANT: Sure, wait a minute.

USER: Sure.

ASSISTANT: Sorry, there was no reservation found on your name.

USER: No problem, thanks for checking.

ASSISTANT: Thank you for availing us.