{{ (messages|selectattr('role', 'equalto', 'system')|list|last).content|trim if (messages|selectattr('role', 'equalto', 'system')|list) else '' }}

{%- for message in messages -%}
    {%- if message['role'] == 'user' -%}
        {{- '<_user>' + message['content'] +'<_bot>' -}}
    {%- elif message['role'] == 'assistant' -%}
        {{- message['content'] + '<_end>' -}}
    {%- endif -%}
{%- endfor -%}