Macos AppleScript：如果文件存在，则复制到路径

我正在尝试编写一个应用程序脚本，检查我选择的文件夹中是否有一个名为file.pages的文件，如果有，Finder应将其复制到设置的路径。。。有没有可能我正在使用there top作为existb当commad:和选择文件夹时，我使用命令：choose folder；抵消结果

谁能帮我写下剧本吗？我不了解copy命令以及如何使用POSIX，请尝试：

set fileName to "file.pages"

set myFolder_alias to choose folder
try
    tell application "Finder" to set myFile to (first file of myFolder_alias whose name is fileName)
on error
    return fileName & " does not exist in " & myFolder_alias
end try

set myAlias to myFile as alias
set myHFS_Path to myAlias as text
set myPosixPath to POSIX path of myAlias