@franckfct Your data is fairly straight forward and you should be able to use a number of different visualizations. Lens has a nifty feature that gives suggestions on what charts to use for your data type and shape. I suggest trying that out. Here are a few links to get you started:
What you want to visualize from the data above?
You talk about pie chart, so probably you want to see a "duration" chart about Availability vs Unavailability?
If so you could create a new runtime field to compute the duration of each record ( end - start ) and then use Lens as suggested by @cheiligers to generate the visualization.
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