ArrayList<Message> messageList = new ArrayList<>();
messageList.add(new Message("Hello. How are you?", false, System.currentTimeMillis()));

  List<FirebaseTextMessage> chatHistory = new ArrayList<>();
        for (Message message : messageList) {
            if (message.isLocalUser && !isEmulatingRemoteUser || !message.isLocalUser && isEmulatingRemoteUser) {
                chatHistory.add(FirebaseTextMessage.createForLocalUser(message.text,
                        message.timestamp));
            } else {
                chatHistory.add(FirebaseTextMessage.createForRemoteUser(message.text,
                        message.timestamp, REMOTE_USER_ID));
            }
        }
       FirebaseNaturalLanguage.getInstance().getSmartReply().suggestReplies(chatHistory)
                .continueWith(new Continuation<SmartReplySuggestionResult, List<SmartReplySuggestion>>() {
                    @Override
                    public List<SmartReplySuggestion> then(@NonNull Task<SmartReplySuggestionResult> task) {
                        return task.getResult().getSuggestions();
                    }
                });