List of all bookings in the next 3 days In a content type i have a field date which has a start date and end date. using views i want to put filter in such a way that it display results in a date range form now to next 3 days. In a fields i can see content:dates and in filter i can see start and end like this.

After selecting content:start date i dont know waht to do screen shot like this
Try to change your "Date selection" in your second screenshot to "Text". If I remember correctly, you can now provide a text as paramaters.
There you can add things like 
from: now and till: now +3 days