You can find free materials that help to improve your pronunciation and fluency here.
http://www.talkenglish.com/conversation/course.aspx
Free online English conversation courses to help you improve your spoken English
http://eslgold.com/speaking/phrases/
There are videos and useful phrases on various topics for you to learn what to say in different situations.
https://www.apoven.com/siri-english-learning/
This article provides good suggestions on how you can make use of the voice assistant on your devices to learn English and practise speaking and listening to English. Even though the article is about using Siri on Apple devices, the suggestions also apply to other voice assistants such as the Google Assistant and Bixby (Samsung) on your Android devices.
Here's a funny commercial that Apple produced to promote Siri.