YOU SAID:
send a message to jon saying i'll be home soon
INTO JAPANESE
もうすぐ家に帰るというメッセージをジョンに送る
BACK INTO ENGLISH
send a message to john that he will be home soon
INTO JAPANESE
もうすぐ帰宅するというメッセージをジョンに送る
BACK INTO ENGLISH
send a message to john that he will be home soon
That didn't even make that much sense in English.