You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

USER: I am Janet Williams. I want to change an existing reservation, due to my personal problems. Could you help me in changing a reservation?

ASSISTANT: Sure, we can help you. Please wait a moment, I will check the status and let you know.

USER: Sure.

ASSISTANT: Unfortunately there is no reservation is active on your name to change.

USER: Not an issue. Thank you.

ASSISTANT: Thank you for reaching our service.