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* G20 Summit begins, U.S.-China to hold trade talks
* Lighthizer, Trump make optimistic trade comments
* Marriott falls after reporting data breach
* Energy stocks fall on lower oil prices
* Dow down 0.12 pct, S&P up 0.14 pct, Nasdaq up 0.09 pct (Changes comment, updates prices)
By Amy Caren Daniel
Nov 30 (Reuters) - U.S. stocks seesawed between slight gains and losses on Friday, as investors kept away from making big bets ahead of a trade meeting between the United States and China that could decide the course of a bitter trade dispute between the two economies.
Markets have been roiled by conflicting headlines in the run up to the high stakes trade talk, but found some relief after U.S. Trade Representative Robert Lighthizer said he would be surprised if Saturday's dinner between U.S. President Donald Trump and China's Xi Jinping "wasn't a success".
Trump said on Friday there were some good signs ahead of his meeting with Xi on the sidelines of the annual gathering of 20 industrialized nations which began in Buenos Aires.
On Thursday, however, Trump had said he was close to making a deal but was not sure if he wants to do it.
Meanwhile, Beijing said it hoped to persuade Trump to abandon plans to hike tariffs on $200 billion of Chinese goods to 25 percent in January from 10 percent at present.
"The next big thing that would cause the markets to rally would be a de-escalation of the trade war and until that point the markets will follow a bit of a holding pattern," said Rick Meckler, partner, Cherry Lane Investments, in New Vernon, New Jersey.
Dovish comments from Federal Reserve Chair Jerome Powell and the latest Fed minutes have helped the benchmark S&P 500 rise 4 percent this week, setting it on course to post its biggest percentage gain in nine months.
At 12:49 a.m. EDT the Dow Jones Industrial Average was down 30.51 points, or 0.12 percent, at 25,308.33, the S&P 500 was up 3.73 points, or 0.14 percent, at 2,741.49 and the Nasdaq Composite was up 6.41 points, or 0.09 percent, at 7,279.49.
Energy stocks fell 0.51 percent, leading declines among the major S&P sectors, as oil prices dropped.
However, airlines stocks got a boost from lower oil prices, with the Dow Jones Airlines index rising 1.8 percent.
General Electric shares fell 6.0 percent after the Wall Street Journal reported several former employees told the U.S. securities regulator the company failed to acknowledge worsening results in the insurance business.
Marriott International Inc dropped 5.7 percent after the company said a guest reservation database of its Starwood Hotel brand was breached, potentially exposing information on about 500 million guests.
Declining issues outnumbered advancers for a 1.18-to-1 ratio on the NYSE and for a 1.01-to-1 ratio on the Nasdaq.
The S&P index recorded 19 new 52-week highs and six new lows, while the Nasdaq recorded 34 new highs and 62 new lows. (Reporting by Amy Caren Daniel in Bengaluru; Editing by Arun Koyyur)