Hello again elyanniz

This can only be achieved with some custom CSS.

If you can provide me a customer panel log-in, I would find that selector, and share it with you, so you can include it on the page.

Hello again elyanniz

The customer panel log-in didn't work, so I created a new customer AMELIA TEST

You can hide the cancel option with this custom CSS:

.am-cabinet-dropdown-menu > li:nth-child(2) {
display: none !important;
}

I already added that CSS to the Customer Panel page, so you should now only see "Reschedule" when you log in.