path: root/addons/im_livechat/data/im_livechat_channel_data.xml

<?xml version="1.0"?>
<odoo>
    <data noupdate="1">
        <record id="im_livechat_channel_data" model="im_livechat.channel">
            <field name="name">YourWebsite.com</field>
            <field name="default_message">Hello, how may I help you?</field>
        </record>
    </data>
</odoo>