{% if messages[0]['role'] == 'system' %}

    {% set offset = 1 %}

{% else %}

    {% set offset = 0 %}

{% endif %}

{{ bos_token }}

{% for message in messages %}

    {% if (message['role'] == 'user') != (loop.index0 % 2 == offset) %}

        {{ raise_exception('Conversation roles must alternate user/assistant/user/assistant/...') }}

    {% endif %}

    {{ '<|' + message['role'] + '|>\n' + message['content'] | trim + '<|end|>' + '\n' }}

{% endfor %}

{% if add_generation_prompt %}

    {{ '<|assistant|>\n' }}

{% endif %}