Hello!

There are many different species of jasmines. Do you know the botanical name of yours? Or can you post a picture?
Is your window sunny? How long have you had the plant? Are you fertilizing it every two weeks or so?
The more information you can give us the better chances someone can help you.
If you're growing Jasminum polyanthum it will require cool temperatures (I believe between 40 and 60) to set buds.

-Robert

Here is a link that might be useful: How to get pink jasmine to bloom