You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

USER: Can you please change my existing reservation?

ASSISTANT: Sure, I am here to help you. May I know your good name please?

USER: I am Linda Parker.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry Parker, there is no active reservation found as per your name to cancel it.

USER: It's ok, thank you.

ASSISTANT: You are welcome.