System prompts are Architect-provided, generic prompts to indicate numbers, dates, days of the week, months, and so on. You cannot delete System prompts, nor can you rename a system prompt name, change the description, or modify the text on a system prompt resource. 

You can, however, override the default audio. You can also add audio for a language not already set up with a system prompt. For example, let's assume you want to modify the System "estimated_wait_time_about" prompt resources for en-US. You can choose to edit the prompt and in the Resources area, record or upload your own .wav file for English.

Text for system prompts with default audio that is not overridden appears in a lighter text for the audio duration. To confirm whether the audio is default, click the audio duration link. A menu appears, with a message that states whether or not default audio is being used. If the audio was overridden, to return the prompt to the default audio click the Revert to default link.