dubai june 5 reuters  commercial bank of dubai cbddu has hired banks to arrange a debut sale of us dollardenominated green bonds a bank document showed on monday citi emirates nbd capital first abu dhabi bank hsbc jpmorgan natixis and standard chartered will hold investor calls on monday and tuesday the document from one of the banks showed a fiveyear benchmarksized issuance  typically at least 500 million  will follow subject to market conditions