{% if bos_token is defined and bos_token is not none %}{{ bos_token }}{% endif %}{% for message in messages %}{% if message.role in ['system', 'user', 'assistant'] %}{{ '<|im_start|>' + message.role + '\n' + message.content + '<|im_end|>\n' }}{% endif %}{% endfor %}{% if add_generation_prompt %}{{ '<|im_start|>assistant\n' }}{% endif %}