Where can I modify or cancel my SIXT reservation?

You can modify or cancel your SIXT reservation via the initially used booking channel, e.g. the SIXT Moblity Solution or travel agency.
If you made your reservation via a SIXT booking channel (Mobility Solution, App, Website) you can amend your reservation in your SIXT profile on the website or App. There, you can also extend your reservation or cancel it.