Scaling positive and negative values on primary and secondary axis respectively

Hello Guys,

I have the following data:

Katalog Redemption Platform
Miles -302351940 -764328242
Bookings 7082 11861

Now when I am trying to plot a graph with Miles on Primary Y axis and Bookings on secondary Y-axis, I am getting a chart as shown in the excel sheet attached. The y=0 line is the top most horizontal axis in the graph. What I want is that the Y=0 line should lie exactly in the center of the chart so that the negative values for miles lie below the y=0 line and the positive values of bookings lie above the y=0 line. Please help!!!

Thanks,
Ankit