code: def _convert_json_response_to_DataFrame(self, json_response):
      messages = json_response["messages"]
      columns = ["text", "ts", "user"]
      data_df = pd.DataFrame(columns=columns)
      for message in messages:
          if message["text"] and message["ts"] and message["user"]:
              data_df.loc[len(data_df.index)] = [
                  message["text"],
                  message["ts"],
                  message["user"],
              ]
      return data_df
  
file_path: evadb/evadb/third_party/databases/slack/slack_handler.py
imports: import pandas
  from slack_sdk import WebClient
  from slack_sdk.errors import SlackApiError
  from evadb.third_party.types import DBHandler, DBHandlerResponse, DBHandlerStatus
label_desc: Use image node_id 8 for calling the SlackHandler obj's underlying member method code with example usage: obj._convert_json_response_to_DataFrame(json_response) and returns: data_df