You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: I am Benjamin Hernandez. I want to change my reservation due to some health issue. Can you change my reservation?

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: There is no reservation found with your name.

USER: Ok, thank you for informing me.

ASSISTANT: Have a good day.