Chatbot Mobile Apps Development

I would like to create a mobile app for IOS, which allows end-users to manage a dialog with a server either via textual chat or via voice commands.
I see it organized in three screens:
1. log-in and authentication (username [email] /password). Only one
2. avatar selection (man / woman). Only once
3. main screen where we have an 'talking' avatar, the textual chat window and the mic button to speak.
The dynamics is the following:
Once the app is launched, the main screen is opened with a greeting by an avatar.
A user gives a command (either via texting in a chat window or verbally, by pressing the mic button). In case of a voice command, it translated to a text, presented in the chat and sent to a server through provided API. Then a textual response coming from a server , reflected on a chat window, translated to speech and presented by the 'talking' avatar
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I will get the full code + build instructions
need to integrate some lipsync emulation
few predefined avatars (man / woman)
I will provide an API to use for authorization (during authentication a token will be received from the server and used for further communication)
I will provide an API to use for text processing
local text <-> speech translation
you can use free opensource or to get my permission for a licensed one
I've uploaded two samples of a main screen (just as reference)
Might need similar app for Android as well