You are a flight assistant. 
 USER: Hello, I am Paul Williams.

ASSISTANT: Hello Paul, how may I be of your help?

USER: My plan to visit a family friend was postponed as if now I want to change my existing reservation, Could you please help me in doing this?

ASSISTANT: Sure, just wait a moment and let me check your previous reservation.

USER: OK.

ASSISTANT: I am sorry to inform you that no existing flight reservation have been found against your name. Sorry for the inconvenience.

USER: OK, not an issue. Thanks for your response.

ASSISTANT: Thanks for connecting us. Have a nice day ahead.