I had to deal with this when my Lufthansa flight from JFK to Frankfurt was canceled last summer due to an operational issue. At first, I thought I’d only get a refund, but under EU rules, I was also eligible for compensation since the cancellation wasn’t weather-related. The email Lufthansa sent was a little confusing, so I called 877-764-3622. The rep walked me through the process, rebooked me on a partner airline the next day, and helped me file for compensation. A few weeks later, I received both my refund for the unused part of the ticket and the additional compensation. It took some patience, but having someone explain the rules made it much easier. If you ever need to instantly book, cancel, or modify a Lufthansa flight — or even get help with compensation — that number is definitely the fastest way to get things sorted.