{{ bos_token }}
{% if messages[0]['role'] == 'system' %}
  {{ raise_exception('System role not supported') }}
{% endif %}
{% 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'] == 'assistant' %}
<start_of_turn>model
{% generation %}{{ message['content'] | trim }}
<end_of_turn>{% endgeneration %}
  {% else %}
<start_of_turn>{{ message['role'] }}
{{ message['content'] | trim }}
<end_of_turn>
  {% endif %}
{% endfor %}
{% if add_generation_prompt %}
<start_of_turn>model
{% endif %}