$response = $bot->getProfile($event['source']['userId']);
if ($response->isSucceeded()) {
$profile = $response->getJSONDecodedBody();
}

if($userMessage == "halo"){
$textMessageBuilder = new \LINE\LINEBot\MessageBuilder\TextMessageBuilder("halo" . $profile['displayName'] . ", salam kenal");
$result = $bot->replyMessage($event['replyToken'], $textMessageBuilder);
return $result->getHTTPStatus() . ' ' . $result->getRawBody();
}