Markets open flat tracking global cues: Markets have started the session on a lower note tracking weak global cues. The 30-share Sensex has opened lower by 32.44 points at 27,796.00 and the Nifty dipped 3.60 points at 8,430.05. On the macro-economic front, India's gross domestic product (GDP) grew 7.3% in 2014-15, slightly less than the advance estimate of 7.4%. The Reserve Bank's Monetary Policy review on Tuesday will set the tone for the domestic bourses this week. On macro front, HSBC manufacturing PMI and service PMI data is scheduled on June 1 and 3, respectively.