You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Stephanie Carter.

ASSISTANT: How can I help you Stephanie Carter?

USER: I have a change in my plan. So, I would like to change my existing reservation.

ASSISTANT: Wait a moment please, let me check the status of your reservation.

USER: Sure.

ASSISTANT: Sorry to say, there is no reservation found with your name in our database.

USER: That's fine. Thank you for your service.

ASSISTANT: Thank you for approaching us.