Adds details April 13 (Reuters) - JPMorgan Chase & Co JPM.N reported a fall in first-quarter earnings on Wednesday, hurt by a slowdown in dealmaking brought on by the Ukraine conflict and a decline in trading revenue. The big U.S. banks are reporting results at a time when inflation is at its highest in decades, which could lead the Federal Reserve to hike interest rates more aggressively this year. In the same quarter a year earlier, banks had benefited from exceptionally strong dealmaking and trading and the release of funds set aside for loan losses.