Greece's creditors see limited scope to accommodate Athens in talks on financing for reforms to clinch a deal on Saturday and are willing to reaffirm a 2012 promise to consider rescheduling its debt, a senior official close to the talks said. The chances of a deal on Saturday, when euro zone finance ministers meet at 1200 GMT were better than 50 percent, the official said, although it was less certain if the Greek parliament would endorse an agreement struck by the government. If Greece were to accept the offer with some small new concessions to accommodate Athens' views, the country could then count on financing for the next five months -- until the end of November -- thanks to a bailout extension.