Update app.py

app.py

@@ -107,7 +107,7 @@ def generate_text(messages, engine='gpt-3.5-turbo', max_tokens=2048, temperature
     response = openai.ChatCompletion.create(
         model=engine,
         messages=[{"role": "system", "content": "You are a research assistant"},
-             {"role": "user", "content": prompt}],
+             {"role": "user", "content": question}],
         max_tokens=max_tokens,
         n=1,
         temperature=temperature