How to handle parameters in dialogflow

I have parameters defined under intent and It still ask me to enter size and color. I am puzzled how can I handle these variables?. When both of the variable is recorded before page is getting active how can I show the confirmation message without collecting the data again.

any hint?

Best

I believe you are looking for order intent with intent parameters. In the documentation you can see that the sample created Parameter ID with entity type of custom entity type and system entity type.

You need an intent that is matched when the end-user requests a new shirt order. This intent should also optionally capture the desired shirt color and/or size provided by the end-user in case they provide that info up front