diff --git a/DialogManager.ipynb b/DialogManager.ipynb
index e69de29..361c4c5 100644
--- a/DialogManager.ipynb
+++ b/DialogManager.ipynb
@@ -0,0 +1,97 @@
+{
+ "cells": [
+  {
+   "cell_type": "code",
+   "execution_count": 14,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "import json\n",
+    "import os\n",
+    "\n",
+    "\n",
+    "class DST():\n",
+    "    def __init__(self):\n",
+    "        self.state = json.load(open('dictionary.json'))\n",
+    "\n",
+    "    def update(self, user_act=None):\n",
+    "        for intent, domain, slot, value in user_act:\n",
+    "            domain = domain.lower()\n",
+    "            intent = intent.lower()\n",
+    "            slot = slot.lower()\n",
+    "            \n",
+    "            if domain not in self.state['belief_state']:\n",
+    "                continue\n",
+    "\n",
+    "            if intent == 'inform':\n",
+    "                if slot == 'none' or slot == '':\n",
+    "                    continue\n",
+    "\n",
+    "                domain_dic = self.state['belief_state'][domain]\n",
+    "\n",
+    "                if slot in domain_dic:\n",
+    "                    self.state['belief_state'][domain][slot] = value\n",
+    "\n",
+    "            elif intent == 'request':\n",
+    "                if domain not in self.state['request_state']:\n",
+    "                    self.state['request_state'][domain] = {}\n",
+    "                if slot not in self.state['request_state'][domain]:\n",
+    "                    self.state['request_state'][domain][slot] = 0\n",
+    "\n",
+    "        return self.state"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 15,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "dst = DST()\n",
+    "user_act = [('inform', 'payment', 'type', 'credit card'), ('inform', 'product', 'name', 'iPhone')]\n",
+    "state = dst.update(user_act)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 16,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "{'payment': {'type': 'credit card', 'amount': '', 'loyalty_card': ''}, 'delivery': {'type': '', 'address': '', 'time': ''}, 'product': {'name': 'iPhone', 'type': '', 'brand': '', 'price': '', 'quantity': '', 'quality': ''}}\n",
+      "{}\n"
+     ]
+    }
+   ],
+   "source": [
+    "print(state['belief_state'])\n",
+    "print(state['request_state'])"
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "py38",
+   "language": "python",
+   "name": "python3"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 3
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
+   "version": "3.8.16"
+  },
+  "orig_nbformat": 4
+ },
+ "nbformat": 4,
+ "nbformat_minor": 2
+}