How to display the old and the values in emails

Hi.

I'm trying to send an email after e.g. user's last name is changed and I want to show the old and the new values in email like this:

"Your name was Kim Westwood , now it's Kim Eastwood ."

I have tried to use [//RequestParameter/AllChangesActionTable] but it just shows the new value.

How do I do this?

Thanks.