You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I would like to change my reservation due to some health issues, can you please help me out with that?

ASSISTANT: Sure, may I know your name please?

USER: Thank you. Stephen King.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Sorry to inform you that there is no active reservation found with your name in our records.

USER: Ok, no problem. Anyway thank you for checking out.

ASSISTANT: Most welcome.