I am a university student and remotely work for a community, and always communicate with my lead (who is a working lady, and usually busy with her work) on WhatsApp and messenger. Before organizing any local/global event or webinar, I sometimes need to call her in order to discuss different things. I am always confused about how to ask her if she is free for a call/when she will be free if busy right now in a polite and friendly manner. Also, she is very sweet and humble.
When she needs to talk or have something to discuss with me, usually she asks "good time to sync up?". How should I ask her the same question?