Chat Bot App for Fraud Prevention

I need an experienced developer to build a chat bot app that links to an application that has Dialogflowcx frontend. The application should be convertible for both Android and iOS platforms. Major function required is a real-time chat mechanism, cut and paste email texts into the chatbot and covert voice to text. Your expertise should include but is not limited to android development, iOS development, and deploying mobile applications. Please apply if you have a strong background in chat bot development and integration with Dialogflowcx. Emphasis should be placed on ensuring that the app runs smoothly on both platforms and the chat bot is highly responsive in real-time conversations.