Bool slot in Form is getting set for intent affirm or deny

I have created two forms which will take an order for pasta and pizza. So in pasta form I have mentioned pasta_extra_sause slot as bool with mapping for affirm yes value and for deny no value. After completion a form i have written a story which will ask do you want to confirm your order and when we say yes then pasta_extra_slot is getting filled with yes value. How can I avoid this overlapping condition of slot filling