This project proposes a simulation model of intelligent parking system that has the ability to search for vacancies in the building or parking through mobile phones using voice command. The purpose of this project is to be convenient and quick in searching for parking spaces and to count the number of car entering park area each day. The developed system uses the NodeMCU ESP8266 microcontroller to detect the vacancy status and count the number of users of the parking lot using infrared and ultrasonic sensors. The collected data will be sent to Firebase database. For voice command system it is developed by using Dialogflow to create ChatBot and connect with the Google Assistant. Users can interact using voice to search the vacancy in parking area directly. From the experiment it is found that the developed parking lot system can display the vacancies correctly. When increasing the number of cars into the parking lot the system can display the status that has changed correctly. Moreover when inquiring for parking the system can find the nearest vacancy for user. In the future there are plans to develop additional equipment and implement the proposed system in real locations.