Hi.
When you buy a ticket via WooCommerce, it goes through Woo’s cart and checkout processes.
Eventually, the customer ends up at a URL like your-site-com/checkout/order-received/1234/?key=wc_order_582727272723b27, where the Woo conditional is_order_received_page() should be true. It’s all handled by the [woocommerce_checkout] shortcode / the page you add that shortcode to.
Therefore, you could likely use an action hook like woocommerce_thankyou to redirect to another page. A plugin like https://wordpress.org/plugins/custom-thank-you-page-for-woocommerce/ might be a good way to go too (third-party, not guaranteed or supported by us, and I’ve not used it before).
If you need some coding help, you may want to ask your developer or reference our documentation and list of known customizers.
Please let me know how this goes for you.