fix aync requests

main.py

@@ -766,7 +766,7 @@ class HealthcareChatbot:
                             headers=self.headers,
                             timeout=aiohttp.ClientTimeout(total=10)
                         )
-                        return await response.json
+                        return await response.json()
 
                 except aiohttp.ClientResponseError as e:
                     retries += 1