By Niket Nishant and Sukriti Gupta (Reuters) -Futures tied to the S&P 500 and the Nasdaq nudged higher on Wednesday as investors assessed measured comments from U.S. Federal Reserve Chair Jerome Powell and looked ahead to key economic data due later in the week. While the recent numbers point to a resilient economy, commentary from Fed officials has injected some wariness, especially about the labor market. Powell added to the cautious tone on Tuesday, noting that asset prices appeared fairly highly valu ...