class BookingDetails(BaseModel):
    """Information extracted from the conversation.

    ``size_info`` is square footage for a house and seat count for a couch.
    Fields are optional because this model also represents partial extraction.
    """

    service_type: ServiceType | None = Field(default=None)
    size_info: float | None = Field(default=None, gt=0)
    cleaning_depth: CleaningDepth | None = Field(default=None)
    add_ons: list[str] = Field(default_factory=list)
    address: str | None = Field(default=None)
    is_complete: bool = False
    next_question: str | None = Field(
        default=None,
        exclude=True,
        description="A concise question asking only for information still missing.",
    )