{%- if messages[0]['role'] == 'system' -%}
    {%- set system_message = messages[0]['content'] -%}
    {%- set messages = messages[1:] -%}
{%- else -%}
    {% set system_message = '' -%}
{%- endif -%}

{{ bos_token + system_message }}
{%- for message in messages -%}
    {%- if (message['role'] == 'user') != (loop.index0 % 2 == 0) -%}
        {{ raise_exception('Conversation roles must alternate user/assistant/user/assistant/...') }}
    {%- endif -%}

    {%- if message['role'] == 'user' -%}
        {{ 'USER: ' + message['content'] + '\n' }}
    {%- elif message['role'] == 'assistant' -%}
        {{ 'ASSISTANT: ' + message['content'] + eos_token + '\n' }}
    {%- endif -%}
{%- endfor -%}

{%- if add_generation_prompt -%}
    {{ 'ASSISTANT:' }}
{% endif %}