Modify the title of the printout

Hi, I would like to update the title name of the printout , it always show at the beginning the name that i have used in xml code

    <record model="ir.action.report" id="report_operation">
        <field name="name">Operation</field>
        <field name="model">operation.instructions</field>
        <field name="report_name">operation.operation_report</field>
        <field name="report">operations/reports/operation_report.odt</field>
        <field name="extension">pdf</field>
    </record>

    <record model="ir.action.keyword" id="keyword_report_operation">
        <field name="keyword">form_print</field>
        <field name="model">operation.instructions,-1</field>
        <field name="action" ref="report_operation"/>
    </record>

—>My goal is to don’t let “Operation” name appear when i want to download the printout(Now it shown me after download “Operation - the name field of the party” but i want just to show me “the name field of the party(party.name)”
As an example i don’t want to show me “Operation-Melina.pdf”
, I want to show me just"Melina.pdf" is that feasible to do??
if yes , how i can do that

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