odoo/addons/event/email_template.xml

<?xml version="1.0"?>
<openerp>
    <data>
        <record id="confirmation_event" model="email.template">
        <field name="name">confirmation the event</field>
        <field name="model_id" ref="event.model_event_registration"/>
        <field name="email_from" >${object.user_id.user_email or object.company_id.email or 'noreply@localhost'}</field>
        <field name="email_to" >${object.email_from}</field>
        <field name="subject">Ticket for ${object.event_id.name}</field>
        <field name="body_text">
        hello ${object.contact_id.name},

        The event ${object.event_id.name} that you registered from is confirmed and will be held from ${object.event_id.date_begin} to ${object.event_id.date_end}. For any further information please contact our event department.

        we thank you for your participation

        best regards
        </field>
        </record>

    </data>
    <data>

        <record id="confirmation_registration" model="email.template">
        <field name="name">confirmation the registration</field>
        <field name="model_id" ref="event.model_event_registration"/>
        <field name="email_from" >${object.user_id.user_email or object.company_id.email or 'noreply@localhost'}</field>
        <field name="email_to" >${object.email_from}</field>
        <field name="subject">Ticket for ${object.event_id.name}</field>
        <field name="body_text">
        hello ${object.contact_id.name},

        We confirm your registration to the event ${object.event_id.name} to be held from ${object.event_id.date_begin} to ${object.event_id.date_end}

        we thank you for your participation

        best regards
        </field>
        </record>

    </data>
</openerp>