Autonomy Voice Assistant (AVA) is a prototype voice interaction system designed to seamlessly integrate into the NASA Platform for Autonomous Systems (NPAS), enabling an operator to interact with NPAS applications through voice conversations. An NPAS application that includes an integrated AVA facilitates a major enhancement of Human-System interface via interaction through natural language expressions. An AVA prototype has been designed incorporating two principles: (1) self-containment (no external data or computations required), and (2) a readily modifiable and flexible architecture. Using voice messages in an NPAS application provides an additional layer of user interface capability and enhances a user’s interactive experience. Advancements, over the past several decades, on speech recognition and natural language processing technologies, has enabled AVA to implement robust messaging capabilities while still being lightweight. The main objective of a voice assistant like AVA is to enhance the number and effectiveness of interactions a user has with a system that typically uses mouse-based interaction, while simultaneously providing heightened system awareness.