diff --git a/chatbot.py b/chatbot.py
index 6b218a5..94b2cb7 100644
--- a/chatbot.py
+++ b/chatbot.py
@@ -1,34 +1,108 @@
 import streamlit as st
 import openai
 import os
-
 from dotenv import load_dotenv
 
 load_dotenv()
-
 openai.api_key = os.environ["OPENAI_API_KEY"]
 
+# Sidebar
+st.sidebar.title("Configuration")
+
+
+def model_callback():
+    st.session_state["model"] = st.session_state["model_selected"]
+
+
+if "model" not in st.session_state:
+    st.session_state["model"] = "gpt-3.5-turbo"
+
+st.session_state.model = st.sidebar.radio(
+    "Select OpenAI Model",
+    ("gpt-3.5-turbo", "gpt-3.5-turbo-16k"),
+    index=0 if st.session_state["model"] == "gpt-3.5-turbo" else 1,
+    on_change=model_callback,
+    key="model_selected",
+)
+
+st.sidebar.markdown(
+    f"""
+    ### ℹ️ <span style="white-space: pre-line; font-family: Arial; font-size: 14px;">Current model: {st.session_state.model}.</span>
+    """,
+    unsafe_allow_html=True,
+)
+
+# Bot roles and their respective initial messages
+bot_roles = {
+    "bot_role_1": {
+        "role": "system",
+        "content": "You are a friendly bot that speaks only Polish",
+        "description": "This is a friendly bot speaking in Polish.",
+    },
+    "bot_role_2": {
+        "role": "system",
+        "content": "You are a friendly bot that speaks only German",
+        "description": "This is a friendly bot speaking in German.",
+    },
+    "bot_role_3": {
+        "role": "system",
+        "content": "You are a friendly bot that speaks only English Pirate",
+        "description": "This is a friendly bot speaking in English Pirate.",
+    },
+}
+
+
+def bot_role_callback():
+    st.session_state["bot_role"] = st.session_state["bot_role_selected"]
+    st.session_state["messages"] = [bot_roles[st.session_state["bot_role"]]]
+
+
+if "bot_role" not in st.session_state:
+    st.session_state["bot_role"] = "bot_role_1"
+
+st.session_state.bot_role = st.sidebar.radio(
+    "Select Bot Role",
+    tuple(bot_roles.keys()),
+    index=list(bot_roles.keys()).index(st.session_state["bot_role"]),
+    on_change=bot_role_callback,
+    key="bot_role_selected",
+)
+
+description = bot_roles[st.session_state["bot_role"]]["description"]
+
+st.sidebar.markdown(
+    f"""
+    ### ℹ️ Description
+    <span style="white-space: pre-line; font-family: Arial; font-size: 14px;">{description}</span>
+    """,
+    unsafe_allow_html=True,
+)
+
+
+# Function to reset messages
+def reset_messages():
+    return [bot_roles[st.session_state["bot_role"]]]
+
+
+# Main App
 st.title("My Own ChatGPT!🤖")
 
+# Initialize session state
 if "messages" not in st.session_state:
-    st.session_state.messages = []
-
+    st.session_state["messages"] = reset_messages()
 
+# Display messages
 for message in st.session_state["messages"]:
     with st.chat_message(message["role"]):
         st.markdown(message["content"])
 
-# initialize model
-if "model" not in st.session_state:
-    st.session_state.model = "gpt-3.5-turbo"
-
-# user input
+# User input
 if user_prompt := st.chat_input("Your prompt"):
     st.session_state.messages.append({"role": "user", "content": user_prompt})
     with st.chat_message("user"):
         st.markdown(user_prompt)
 
-    # generate responses
+    # Generate responses
     with st.chat_message("assistant"):
         message_placeholder = st.empty()
         full_response = ""
@@ -43,5 +117,6 @@
         ):
             full_response += response.choices[0].delta.get("content", "")
             message_placeholder.markdown(full_response + "▌")
+        message_placeholder.markdown(full_response)
 
     st.session_state.messages.append({"role": "assistant", "content": full_response})
diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..00872a3
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1,3 @@
+openai
+streamlit
+python-dotenv
\ No newline at end of file