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Your prompt doesn’t just decide what the assistant says — it decides how spoken details land. A phone number typed as digits and a phone number spelled out for speech can sound very different once a voice reads them aloud. A few habits make the difference.
This page is about how you write the words in your prompt and knowledge base. To fix how a specific name or term is pronounced everywhere, use the pronunciation dictionary instead — the two are complementary.

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Write the spoken form directly

The most reliable technique is also the simplest: instead of relying on the model to reformat digits on the fly, give it the exact words to say. Phone numbers — spell out each digit and group them for clarity:
Email addresses — spell every character, and say the symbols as words:
Websites — say recognizable words normally, and spell out any segment made only of letters:
Times and dates — use a spoken format, never a raw timestamp:

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Pace long strings of digits

Long numbers — account numbers, IBANs, confirmation codes — are easier to follow when they’re broken into short groups with a natural pause between them, rather than read as one unbroken string. A few short groups, separated by commas, are usually enough. Keep the grouping consistent within a prompt, and listen to the result before relying on it — pacing on punctuation can vary slightly by voice.
Don’t overdo it. Long chains of pauses make speech sound unnatural — reserve them for information the caller genuinely needs a moment to write down.

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Giving the caller a moment

If a caller says they need a second — to grab an account number, for example — tell the assistant explicitly how to respond rather than leaving it to guess:

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Test what it actually sounds like

Web Call option in the assistant Test menu

Use Test → Web Call to listen to how the assistant speaks your prompt.

Wording that reads fine on screen doesn’t always sound right out loud. Use the assistant editor’s Test button to place a real voice call and listen — especially after changing a voice, since pacing and pronunciation both depend on it.
See Prompt writing for structuring the rest of the prompt, and Example prompts for ready-to-adapt templates.