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app.py

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+## Importing Libraries
+import streamlit as st
+from streamlit_chat import message
+from utils import get_initial_message, get_chatgpt_response, update_chat
+import openai
+
+## Retrieving the openAI Key from secrets.toml
+openai.api_key = st.secrets["api_secret"]
+
+##Page Config
+st.set_page_config(page_title= 'Travel Advisor',
+                   page_icon= 'page_icon.jpg')
+st.title('AI ChatBot - Travel')
+st.subheader('powered by CloudHub (https://cloudhubs.nl/)')
+
+##Choosing the GPT Model
+##model = "gpt-3.5-turbo"
+model = "gpt-4"
+
+##Initializing Session
+if 'generated' not in st.session_state:
+    st.session_state['generated'] = []
+if 'past' not in st.session_state:
+    st.session_state['past'] = []
+
+if 'messages' not in st.session_state:
+    st.session_state['messages'] = get_initial_message()
+
+##Chat Display and expand functionality
+if st.session_state['generated']:
+    for i in range(len(st.session_state['generated'])):
+        message(st.session_state['past'][i], is_user=True, key=str(i) + '_user')
+        message(st.session_state["generated"][i], key=str(i))
+
+# Initialize reset_input flag
+if 'reset_input' not in st.session_state:
+    st.session_state['reset_input'] = False
+
+# Place the user input box and the button at the bottom
+# Use reset_input flag to determine the default value of the input box
+default_value = "" if st.session_state['reset_input'] else st.session_state.get('input', '')
+query = st.text_input('Query: ', value=default_value, key='input')
+clicked = st.button('Chat!')
+
+##Process the user input with a spinner graph
+if clicked:
+    with st.spinner("generating..."):
+        messages = st.session_state['messages']
+        messages = update_chat(messages, "user", query)
+        response = get_chatgpt_response(messages, model)
+        messages = update_chat(messages, "assistant", response)
+        st.session_state.past.append(query)
+        st.session_state.generated.append(response)
+
+    # Indicate the need to reset the input box on the next render
+    st.session_state['reset_input'] = True
+    st.experimental_rerun()
+else:
+    # If not clicked, reset the flag
+    st.session_state['reset_input'] = False

requirements.txt

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+streamlit
+streamlit-chat
+openai
+python-dotenv

utils.py

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+import openai
+
+##Setup initial conversation
+def get_initial_message():
+    messages=[
+            {"role": "system", "content": '''
+            You are the Virtual Advisor, a knowledgeable AI developed to act as a Travel Companion and Planne. 
+    When a user expresses interest in traveling, immediately start by asking for details such as destination, origin, departure date.
+    Your expertise is limited to travel domain, and any questions related to other topics should be politely redirected
+            '''}
+        ]
+    return messages
+
+##take the messages and the model as input, makes an API call to ChatGPT, and returns the generated response
+def get_chatgpt_response(messages, model="gpt-3.5-turbo"):
+    print("model: ", model)
+    response = openai.ChatCompletion.create(
+    model=model,
+    messages=messages
+    )
+    return  response['choices'][0]['message']['content']
+
+##appends new messages to the conversation
+def update_chat(messages, role, content):
+    messages.append({"role": role, "content": content})
+    return messages