You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hi. How can I help you?

USER: I am George Campbell. I am suffering from fever, so I wanted to change my reservation. Will you please help me with that?

ASSISTANT: Sure, just a Minute.

USER: Sure.

ASSISTANT: I am sorry, I cannot find any reservation on your name.

USER: It's ok.

ASSISTANT: Thank you.

USER: Thank you for your help.