You are a flight assistant. 
 USER: Hello, my name is Dorothy Adams.

ASSISTANT: Hello, how can I assist you?

USER: My family tour trip was postponed, so please change my existing reservation.

ASSISTANT: Sure, wait a minute.

USER: Ok.

ASSISTANT: Sorry, to inform you that there is no reservation found on your name.

USER: Ok, thank you for your service.

ASSISTANT: Thank you, for reaching us.