You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I have made an earlier reservation to attend for a seminar, due to some issues seminar has been postponed. Can you please aid me? Please help me to change my reservation.

ASSISTANT: Ok, may I know your name to check with the previous reservation.

USER: Thanks for accepting my request, Virginia Williams is my name.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Sorry, there are no active reservations on your given name to change.

USER: Ok, thank you.

ASSISTANT: Thank you for reaching our service.