Wells Fargo & CoWFC.N and Citigroup IncC.N fell short of quarterly profit estimates, sending their shares down 3.9% and 0.6% respectively. By Amruta Khandekar and Ankika Biswas Jan 13 (Reuters) - Wall Street's main indexes dipped on Friday as remarks from major U.S. bank executives deepened concerns about the Federal Reserve's monetary tightening slowing economic growth, while Tesla slumped on news of price cuts. The bank's Chief Executive Jamie Dimon listed a number of uncertainties facing the economy including geopolitical tensions and sticky inflation.