You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, Good Morning. How may I guide you?

USER: I am Patrick Wilson. I am planning to change an existing reservation, due to some health issue. Can you please change my reservation?

ASSISTANT: Sure, I can help you with that.

USER: Thank you.

ASSISTANT: Please hold on for a moment while I check for any active reservations with your name.

USER: Sure, take your own time.

ASSISTANT: I am sorry to inform you that there are no existing reservations with your name.

USER: That's fine.

ASSISTANT: Thank you, have a good day.

USER: Thank you for your help.