To book an appointment at Tattva Spa in Delhi, you can follow these steps:

1. Visit the Tattva Spa website www.tattvaspa.com
2. Look for the “Prebook and Save” option on their website.
3. Select the location in Delhi where you want to book the appointment.
4. Choose the type of service or treatment you’re interested in.
5. Pick a date and time that suits you from the available options.
6. Provide any required personal information and contact details.
7. Make a secured payment to confirm your booking.

If you prefer, you can also call Tattva Spa reservation team directly to book an appointment or inquire about availability. They have a contact number listed on their website.