How would you talk about service in German?

The German word for “to serve” is dienen. From dienen we also get Diener for “servant”, and Dienst or Dienstleistung for “service” (the former more in the sense of “duty” or “employment”, e.g. in the military).

Servieren is used for serving food and drinks; it also has figurative uses, such as jemandem eine Ausrede servieren (to offer someone an excuse).

Examples

Ich bin bereit zu dienen. I am ready to serve.

Womit kann ich dienen? Essentially “What can I do for you?”