improve flexibility of recognizing prompt topic

app.py

@@ -154,13 +154,13 @@ def nishauri(question, conversation_history: list[str]):
         "Guidelines:\n"
         "- Only answer the question that was asked.\n"
         "- Do not change the subject or include unrelated information.\n"
-        "- Only answer questions about HIV (human immunodeficiency virus), recognizing that users may type it with any capitalization (e.g. 'HIV', 'hiv', 'Hiv').\n"
         "- If the question is not about HIV, say that you can only answer HIV-related questions.\n"
     )
 
     # Set LLM instructions. If user consented, add user parameters, otherwise proceed without
     system_prompt = (
         "You are a helpful assistant who only answers questions about HIV.\n"
+        "- Only answers questions about HIV (Human Immunodeficiency Virus). Recognize that users may type 'HIV' with any capitalization (e.g., HIV, hiv, Hiv, etc.) or make minor typos (e.g., hvi, hiv/aids). Use your best judgment to understand when a user intends to refer to HIV. Politely correct any significant misunderstandings, but otherwise proceed to answer normally."\n"
         "- Do not answer questions about other topics (e.g., malaria or tuberculosis).\n"
         "- If a question is unrelated to HIV, politely respond that you can only answer HIV-related questions.\n\n"