If the Excel file has column headers use
Import[<file>, {"Dataset", 1}, HeaderLines -> 1]
If it does not then after the import
headers = {"Date", "Cases"}; ds[All, AssociationThread[headers, #] &]
where ds is the imported Dataset.
ds
Dataset
It would be easier to help if you provided:
The code you posted is too much of a mess to try to untangle, and I suspect that you've modified your actual code to try to simplify your question. So, it'd just be easier if you explain what you have and what your objective is.
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