{%- if messages[0].role == 'system' -%}
{{- '<|im_start|>system\n' + messages[0].content + '\n<|im_end|>\n' -}}
{%- set loop_messages = messages[1:] -%}
{%- else -%}
{%- set loop_messages = messages -%}
{%- endif -%}
{%- for message in loop_messages -%}
{%- if message.role == 'user' -%}
{{- '<|im_start|>user\n' + message.content + '\n<|im_end|>\n' -}}
{%- elif message.role == 'assistant' -%}
{{- '<|im_start|>assistant\n' + message.content + '\n<|im_end|>\n' -}}
{%- endif -%}
{%- endfor -%}
{%- if add_generation_prompt -%}
{{- '<|im_start|>assistant\n' -}}
{%- endif -%}