You can say, "I am free on the following days..." or "I am available on Wednesdays after 3 p.m. and Fridays after 9 a.m." Or if it asking about your start date then you would say "I am available starting February 1st".

It think just say "I'm available every Tuesday morning / most Friday evenings / (or whenever you are free). It's polite and professional. -

I think you should answer with the "free days" that are in your week plan.

Listen to what your co-workers (the other "folks") say. If I ask that question, I want to know about their availability over the next week. So I expect answers back like: * "I don't have any availability at all this week." * "I am very busy this week. I don't have any time." * "I have a few hours on Wednesday." * "I have some availability late in the week." * "I have a half hour right now, then nothing until February." * "Why are you asking?" * "If it is really, really important, I can free up some time." * "I just finished a project, so my schedule is wide open." All of those would be polite for my office. All would be appropriate answers, depending on how busy people are. Your office might be more formal than mine. (but the use of "folks" tells me that it isn't very, very, very formal.)

I think you should answer with the "free days" that are in your week plan.