How to let clients change their submissions?

I have another question. If my client has already filled the form and he
comes back too make another reservation, is there a way he can visualize
the data that he filled before? Like, his is already a client and don't
need to fill it up again unless something in his personal data has changed
like his phone number or address.
How can I manage this? Is the client able to change his old data or simply
visualize the data he had entered the first time he used my service?
Thanks again!

Unfortunately, we don't have that feature but chrome saves users credentials when they input them in a form. If the user allows chrome to do so.

You can also add an edit link to your autoresponder in case your user sends a wrong address, they can easily edit it afterwards.

You can check this guide. https://www.jotform.com/help/40-How-to-Let-Users-Update-Their-Form-Submissions-at-a-Later-Date

Hope this information helps.

Please let us know if you have further questions.

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I have moved and addressed your question here: https://www.jotform.com/answers/1346379-How-to-send-data-to-a-Wix-website