from linebot.models import TemplateSendMessage

confirm_template_json = {
    "type": "confirm",
    "text": "Are you sure?",
    "actions": [
        {
            "type": "message",
            "label": "Yes",
            "text": "yes"
        },
        {
            "type": "message",
            "label": "No",
            "text": "no"
        }
    ]
}

line_bot_api.push_message(line_bot_user_id, 
    TemplateSendMessage(
        alt_text="this is a confirm template",
        template=confirm_template_json
    )
)