pending reservation, auto deleting?

Hello, thank you again for your work, I have a question: is there an automatic system that deletes pending reservation from the db? I mean, if somebody starts the booking process, without paying it, the rooms stays ‘locked’ forever if I don’t delete the booking from the back end? I see that the email confirmation is sent just when somebody really maked the payment, so I were thinking if is there a way that deletes the booking if no payment is done in a given period of time.
Thank you, Andrea.

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