给出一段英文文本，计算其中每个单词的出现次数（不区分大小写），并返回每个单词及其出现次数。 
原文本: "Hello, thank you for reaching out. How may I assist you today? Oh, you have a question about our new product line? Let me see if I can help with that."
hello: 1, thank: 1, you: 2, for:1, reaching:1, out:1, how:1, may:1, i:1, assist:1, today:1, oh:1, have:1, a:1, question:1, about:1, our:1, new:1, product:1, line:1, let:1, me:1, see:1, if:1, can:1, help:1, with:1.