Referring to your enquiry of April 6th, we very much regret that

Referring to your enquiry of April 6th, we very much regret that we are unable to make you an offer for the above-mentioned goods, mainly owing to low stock of this commodity in our-market.
【正确答案】：关于你方4月6日的询价，我们感到遗憾的是，由于我方市场的存货少，不能就上述货物进行报盘。