{{ bos_token }}{%- if messages[0]['role'] == 'system' -%}
{%- set system_message = messages[0]['content'] | trim + '\n\n' -%}
{%- set messages = messages[1:] -%}
{%- else -%}
{%- set system_message = '' -%}
{%- endif -%}
{%- for message in messages -%}
{%- set role = 'model' if message['role'] == 'assistant' else message['role'] -%}
{%- if loop.first and system_message -%}
{{ '<start_of_turn>user\n' + system_message + message['content'] | trim + '<end_of_turn>\n' }}
{%- else -%}
{{ '<start_of_turn>' + role + '\n' + message['content'] | trim + '<end_of_turn>\n' }}
{%- endif -%}
{%- endfor -%}
{%- if add_generation_prompt -%}
{{ '<start_of_turn>model\n' }}
{%- endif -%}