Android AI Chatbot with Speech Capabilities

I'm looking for a professional who can help me train an AI model with the provided data and develop an AI-based conversational chatbot for Android.

Key Points:
- The primary goal of the chatbot is to support Q&A.
- The application should seamlessly support both text and voice-based conversations.
- The app must have capabilities for Speech to Text and Text to Speech.
- The app must be able to run in offline/local mode and must not have any internet dependencies.

Ideal Skills:
- Proficiency in AI model training and development.
- Prior experience in creating chatbots and conversational interfaces.
- Familiarity with integrating Speech to Text and Text to Speech in Android applications.