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You should extract/read data out of ppt and display it to user and also you should provide some interface, where user could enter some data.
After getting the user input, you should insert the data inside your ppt file and send it to user.
For example, we have online demo that asks the user to give some input and then create a ppt given the user data. You should check it.
Note: you can get the code for above sample from your Aspose.Slides for Java zip file.
Regarding coldfusion, you just need to know how java code could be translated to coldfusion script/code. And you can get to know it from little searching over the internet. Then you can find lot of code samples in JAVA on this forum that use Aspose.Slides.
Further, you must go through the Aspose.Slides Programmer’s Documentation, it will save you from lots of hassles.