How to make a prompt reliably end with a certain word?

I’ve done this successfully, but only with very specific, bland prompts. Anytime I start adding more flavor or variation in the example sentences, the AI loses sight of the intended task. The goal is to get it to generate a sentence that ends with a given word while retaining the mood from the prompt’s example sentences.

Did I hear that Open AI was going to release a tool for very specific use cases?