Write a polite message to a buyer or seller

Help me write a polite message to a buyer or seller.

I'm the: [buyer / seller]
Situation: [slow reply, low offer, wrong item, collection delay]
What I want: [confirm, renegotiate, cancel, arrange time]
Any constraints: [dates, price floor]

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

Then:
1. A firm short message.
2. A softer version.
3. A final chase if they go quiet.
4. When to walk away.

Only use what I've told you, leave blanks for anything I haven't given, and don't invent facts, figures or products. UK English.

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