a.我們發現你方報價比我們從其他地方收到的略為偏高，請你方降價，以適應競爭。

We find your quotation slightly higher than those we have received from other sources, and ask you to reduce your price to meet the competition.

b.我們很抱歉地通知你方價格無競爭力，若貴方能降低價格，使我方可接受的話，我們仍對交易感興趣。

We're sorry to inform you that your price has been found uncompetitive, but we're still interested in doing business if you can bring down your price to a level acceptable.