Every wedding vendor I have talked to has the same story. Somewhere around booking number twenty, a client cancels six weeks out, asks for the deposit back, and the vendor realises the "contract" was a WhatsApp message that said "ok booked! ".
Source: [Dev.to](https://dev.to/signcrypt/quote-and-contract-from-the-same-numbers-a-wedding-vendors-spreadsheet-the-11-clauses-that-hold-518)