You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you now?

USER: Please change my existing reservation, due to some health issue.

ASSISTANT: Ok, please mention your good name so I can check with your previous booking status.

USER: Sure, I am Stephanie Perez.

ASSISTANT: Please allow me to check with your previous reservation.

USER: Ok.

ASSISTANT: Stephanie Perez, I am very apologetic to inform you but there is no active reservation found by your name.

USER: Ok, Thank you.

ASSISTANT: Thank you for approaching our agency regarding your help. Have a nice day ahead.