{{ form_start(findClientForm, {
    'attr' : {
        'class':'findClient',
        'novalidate': 'novalidate'
    }
}) }}
<div class="row">
    <div class="col-6">
        {{ form_row(findClientForm.houseNumber) }}
    </div>
    <div class="col-6">
        {{ form_row(findClientForm.lastName) }}
    </div>
</div>
{{ form_end(findClientForm) }}
<div class="findClientStatus"></div>