AppleScript help
Use this instead (source and short explanation):
if the text returned of the result is "Cameron67" then
set the_results to (display dialog "Welcome! What would you like to do?" buttons {"Chrome", "Messages", "More"})
set button_returned to button returned of the_results
if button_returned is "Chrome" then tell application "Google Chrome"
activate
end tell
if button_returned is "Messages" then tell application "Messages"
activate
end tell
if button_returned is "More" then ...