Graph won't update

So I have the following Dash application element:

app.layout = html.Table([
    html.Tr([
        dcc.Dropdown(id='building-dropdown', options=['label': 1, 'value': 1]),
        dcc.Graph(id='graph')
    ])
])

Really simple. The thing is I’m trying to update the graph dynamically through the following callback (using Pandas to create x):

@dash_app.callback(
    Output('graph', 'figure'),
    [Input('building-dropdown', 'value')]
)
def plotData(values):
    if values:
        x = pd.date_range(start='2020-02-01', end='2020-02-07', freq='1H')
        fig = go.Figure(go.Scatter(x=x, y=[1 + i for i in range(len(x))]))
    return fig

And the figure won’t show. Don’t know what to do next, if anything

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