Remove the 'User Message' tag in the quick answer process.

metagpt/roles/di/role_zero.py

@@ -295,6 +295,9 @@ class RoleZero(Role):
         if "QUICK" in intent_result or "AMBIGUOUS" in intent_result:  # llm call with the original context
             async with ThoughtReporter(enable_llm_stream=True) as reporter:
                 await reporter.async_report({"type": "quick"})
+                # remove "[Message] from A to B :" tag.
+                pattern = r"\[Message\] from .* to .*:\s*"
+                memory[-1].content = re.sub(pattern, "", memory[-1].content, count=1)
                 answer = await self.llm.aask(
                     self.llm.format_msg(memory),
                     system_msgs=[QUICK_RESPONSE_SYSTEM_PROMPT.format(role_info=self._get_prefix())],