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41# the call reaches a person together with what the assistant understood
42async def transfer_to_operator(call: Call, ctx: Context) -> Transfer:
43    return await sip.transfer(call.id, OPERATOR_QUEUE)
43    summary = await ctx.summarize(lang=call.language, max_words=60)
44    headers = {
45        "X-Patient-Intent": ctx.intent,            # appointment · results · question
46        "X-Slots-Checked": str(ctx.slots_checked),
47        "X-Summary": summary,
48    }
49    return await sip.transfer(call.id, OPERATOR_QUEUE, headers=headers)
50
51async def book(call: Call, slot: Slot) -> Booking:
52    if not await his.is_free(slot):
53        raise SlotTaken(slot)
52    async with his.lock(slot.doctor_id):           # two calls cannot take the same slot
53        if not await his.is_free(slot):
54            raise SlotTaken(slot)
55        return await his.create_booking(call.patient_ref, slot)