```python
from langchain import OpenAI, ConversationChain

llm = OpenAI(temperature=0)
conversation = ConversationChain(llm=llm, verbose=True)

conversation.run("Hi there!")
```

here's what's going on under the hood

```pycon
> Entering new chain...
Prompt after formatting:
The following is a friendly conversation between a human and an AI. The AI is talkative and provides lots of specific details from its context. If the AI does not know the answer to a question, it truthfully says it does not know.

Current conversation:

Human: Hi there!
AI:

> Finished chain.

>> 'Hello! How are you today?'
```

Now if we run the chain again

```python
conversation.run("I'm doing well! Just having a conversation with an AI.")
```

we'll see that the full prompt that's passed to the model contains the input and output of our first interaction, along with our latest input

```pycon
> Entering new chain...
Prompt after formatting:
The following is a friendly conversation between a human and an AI. The AI is talkative and provides lots of specific details from its context. If the AI does not know the answer to a question, it truthfully says it does not know.

Current conversation:

Human: Hi there!
AI:  Hello! How are you today?
Human: I'm doing well! Just having a conversation with an AI.
AI:

> Finished chain.

>> "That's great! What would you like to talk about?"
```