create reducers

+import { combineReducers } from "redux";
+
+import watson from "./reducer_watson";
+
+export default combineReducers({ watson });

+import {
+    INPUT_SUCCESS,
+    INPUT_FAIL,
+    SESSION_SUCCESS,
+    SESSION_FAIL,
+    MESSAGE_SUCCESS,
+    MESSAGE_FAIL,
+} from "../actions/types";
+
+const initialState = {
+    messages: [],
+    userMessages: [],
+    botMessages: [],
+    botOptions: []
+};
+
+export default (state = initialState, action) => {
+    const { type, payload, botMsg, botLabels } = action;
+    let { messages, userMessages, botMessages, botOptions } = state;
+
+    switch (type) {
+        case INPUT_SUCCESS:
+            messages = [...messages, { message: payload, type: "user" }];
+            userMessages = [...userMessages, {messages: payload, type: "user"}];
+            return {
+                ...state,
+                messages,
+                userMessages,
+            };
+        case INPUT_FAIL:
+            return {
+                ...state,
+            };
+        case SESSION_SUCCESS:
+            localStorage.setItem("session", payload["session_id"]);
+            return {
+                ...state,
+            };
+        case SESSION_FAIL:
+            return {
+                ...state,
+            };
+        case MESSAGE_SUCCESS:
+            botOptions = [...botOptions, { options: botLabels, type: "bot"}];
+            botMessages = [...botMessages, { botMessage: botMsg, type: "bot"}];
+            messages = [...messages, { message: payload, type: "bot" }];
+            return {
+                ...state,
+                messages,
+                botMessages,
+                botOptions,
+            };
+        case MESSAGE_FAIL:
+            return {
+                ...state,
+            };
+        default:
+            return {
+                ...state,
+            };
+    }
+};