Pages function, script, or automation?

When composing letters, I use placeholder texts, e.g.:

[date]

[recipient's name]
[recipient's address, line 1]
[recipient's address, line 2]

In each header of the following pages, I have the date and current page displayed automatically, e.g.:

November 13, 2013
Page 2

In addition, I put the recipient's name above that info, so the header looks something like this:

John Doe
November 13, 2013
Page 2

My question: Can I tell Pages to automatically pull the recipient's name from the placeholder and include it in the header, so I won't have to add John Doe on each page myself? Is there some sort of function, script, or automation?

I appreciate any advice!