Write a sympathy message that doesn't sound hollow

Help me write a sympathy message.

Who died and relationship to the person I'm writing to: [details]
How I knew them: [details]
A real memory if I have one: [optional]
Channel: [card, text, flowers note]

Ask me up to 3 short questions first if anything important is missing. Wait for my answers.

Then:
1. Two short message options.
2. What to avoid (silver linings, 'they're in a better place' unless I ask).
3. A follow-up check-in line for a week later.

Only use what I've told you, leave blanks for anything I haven't given, and don't invent facts, diagnoses or legal outcomes. This is help with wording, not counselling or medical advice; if they're struggling, point them to Samaritans 116 123 or Cruse Bereavement Support 0808 808 1677, and call 999 if anyone is in immediate danger. UK English.

Stay in this ChatGPT chat. Do not turn on apps or connectors, and do not use memory from another chat.