Follow-up when a client goes silent

Write a follow-up message (max 60 words) to [a client] who has not answered my [quote sent on 3 November]. Rules: 1) one friendly line that does not blame them, 2) remind them of the one thing I need from them: [a yes or no on the quote], 3) make the answer easy — they can reply with one word, 4) say the date after which I will release the slot [Friday 14 November]. No guilt, no 'just checking in', no exclamation marks. Start with the result itself — no introduction, no summary at the end.