conversational agent fix (#818)

Author: hwchase17

langchain/agents/conversational/base.py

@@ -75,8 +75,8 @@ def finish_tool_name(self) -> str:
         return self.ai_prefix
 
     def _extract_tool_and_input(self, llm_output: str) -> Optional[Tuple[str, str]]:
-        if f"{self.ai_prefix}: " in llm_output:
-            return self.ai_prefix, llm_output.split(f"{self.ai_prefix}: ")[-1]
+        if f"{self.ai_prefix}:" in llm_output:
+            return self.ai_prefix, llm_output.split(f"{self.ai_prefix}:")[-1].strip()
         regex = r"Action: (.*?)\nAction Input: (.*)"
         match = re.search(regex, llm_output)
         if not match: