You can't cancel a pending e-filed return. However, if you have not e-filed yet, and you do not want to finish your return in TurboTax, you can simply stop, sign out, and leave it unfiled.
If you are using TurboTax Online and if you have not paid yet, or registered or filed your return, you can use the "Clear & Start Over" feature by clicking on "Tax Tools" in the left panel of your TurboTax screen and then "Tools" and then select "Clear & Start Over" to delete your tax data.
Any unfinished returns that have not been filed are eventually purged from the system.
Click here for Can I cancel or amend a pending return?
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