Gst on buses

I am Bus owner . I have rented my bus to travel agency , that travel agency is running the buses, collecting and paying GST @ 5% on tickets booking on AC buses, and Travel Agency is earning the income by the way of Commission on tickets and paying GST over Commission earned @ 18% after that returning the rest of income to me ( Bus Owner) i.e. Ticket Booking after deducting Commission.

Please guide me regarding the head in which i have to show this Income or receipt in GST ?