Customer-support chatbot

import os

from openai import OpenAI

client = OpenAI(base_url="https://api.aimodelsrouter.ai/v1", api_key=os.environ["AMR_API_KEY"])
MODEL = "deepseek/deepseek-v4.1-flash"

# The system prompt is your bot's job description. Keep it short and specific.
history = [{
    "role": "system",
    "content": "You are the support assistant for Acme Shop. Answer in 1-3 short sentences. "
               "If you are not sure, say so and offer to connect the customer with a human.",
}]


def reply(message: str) -> str:
    history.append({"role": "user", "content": message})
    answer = ""
    with client.chat.completions.create(model=MODEL, messages=history, stream=True) as stream:
        for chunk in stream:  # tokens arrive as they are generated
            if chunk.choices and chunk.choices[0].delta.content:
                print(chunk.choices[0].delta.content, end="", flush=True)
                answer += chunk.choices[0].delta.content
    print()
    history.append({"role": "assistant", "content": answer})  # remember the conversation
    return answer


reply("Hi, I think I was charged twice for order #1042.")
reply("What should I do next?")