Dialog boxes are very easy to make in applescript. Script editor comes with a list of commands. hold down control and click on your mouse this menu appears. Go to Dialogs and dialog -2 buttons 2 actions.
This will appear in your script editor.
display dialog "" buttons {"", ""} default button 2
if the button returned of the result is "" then
else
end if
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Here is some sample code:
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display dialog "Is it the weekend?" buttons {"Yes", "No"} default button 2
if the button returned of the result is "Yes" then
say "awesome"
else
say "BOO"
end if
This is my dialog box:
You can see from this the string between the first "" is the question and I have two buttons for each "" and the button highlight is the second one.
And each button just says either awesome or Boo.