如何使用applescript发送imessage文本,仅在提供的服务中发送？

on run {input}
    set targetService to input
    set messageText to "这是一条iMessage文本"
    sendMessage(targetService, messageText)
end run

on sendMessage(targetService, messageText)
    tell application "Messages"
        set targetBuddy to buddy targetService of service "iMessage"
        send messageText to targetBuddy
    end tell
end sendMessage