Passing dialog text to a shell script command

Hi. Newbie here. I got a good book, will learn this sooner or later.
But right now, I got a problem I can't figure out
I'd like to display a dialog box that requests some text. I'd then like to use that text as the variable for a shell commmand.
Let's say for instance that I want to prompt for the asset tag number of the machine and want the result to end up in the ARD Info 1 field. I've got the first and third line, just don't know how to "place" the captured text:
display dialog "What is this Mac's assett tag number?" default answer ""
do shell script "defaults write /Library/Preferences/com.apple.RemoteDesktop Text1 <resultfrom_dialoghere>"
Anyone?
Darrin

You use text returned of:
dialog reply n : Reply record for the ‘display dialog’ command
properties
button returned (Unicode text, r/o) : name of button chosen (empty if ‘giving up after’ was supplied and dialog timed out)
text returned (Unicode text, r/o) : text entered (present only if ‘default answer’ was supplied)
gave up (boolean, r/o) : Did the dialog time out? (present only if ‘giving up after’ was supplied)
ex:
set _result to text returned of (display dialog "What is this Mac's assett tag number?" default answer "")
do shell script "defaults write /Library/Preferences/com.apple.RemoteDesktop Text1 " & quoted form of _result

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