You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I want to change my existing reservation, due to some health issue. Can you please help me out?

ASSISTANT: Sure, I am here to help you out. Please provide me your name to check the reservation status on your name in our database.

USER: My name is Charles Miller.

ASSISTANT: Please allow me a moment.

USER: Ok, take your time.

ASSISTANT: Sorry Nancy Lopez, there is no active reservation on your name in our reservation list.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for reaching us.