How can I handle AppleScript dialog response?

Question

I am using a script that I wrote to automatically write my dynamic IP to a .txt file but my problem is that I cannot get the dialog to close when the quit button is clicked.

set yn to (display dialog "Your ip has been written to the server, the application will re-run in 10 minutes if you DO NOT close this window." buttons {"Quit", "Run again"} giving up after 600)
if yn is equal to "Quit" then
quit
end if

Answer 1

What I ended up doing was

display alert "This is an alert" buttons {"No", "Yes"}
if button returned of result = "No" then
     display alert "No was clicked"
else
    if button returned of result = "Yes" then
         display alert "Yes was clicked"
    end if
end if

You can replace the lines "display alert "No/Yes was clicked"" with whatever code you want to run