@gshikha16 welcome to the KNIME forum
Concerning automatic model building I would like to point you to two approaches. One I built a wrapper for H2O.ai AutoML module - and one version with the added benefit of using R’s vtreat to prepare the data.
You would have to install R on you machine and make it work with KNIME. Yes not the most comfortable setup, but hey: you get some very powerful tools that could help you with these tasks.
Then KNIME is working to deploy Guided analytics and automated machine learning. I am not sure if there currently is a component for regression tasks. Maybe @paolotamag can say something about that.