require 'path/to/vendor/autoload.php';

<?php

use RetailCrm\Common\Exception;
use RetailCrm\Mg\Bot\Client;
use RetailCrm\Mg\Bot\Model\Request\DialogAssignRequest;

$client = new Client('https://mg.url.demo', 'T9DMPvuNt7FQJMszHUd', true);

try {
    $request = new DialogAssignRequest();
    $request->setDialogId(60);
    $request->setUserId(4);

    /* @var \RetailCrm\Mg\Bot\Model\Response\AssignResponse $response */
    $response = $client->dialogAssign($request);
} catch (Exception\LimitException | Exception\InvalidJsonException | Exception\UnauthorizedException $exception) {
    echo $exception->getMessage();
}

echo $response->getPreviousResponsible();