"请问，你有没有笔？"

Translation: Excuse me, do you have a pen?

[ayszhang]

筆 is a vague indicator of any writing tool. Pencil or pen should be correct. Otherwise please specify 鉛筆 or 圓珠筆

[JustusRobi3]

I agree, either pen or pencil should be accepted. Likewise, Finnish, which i speak, has a single word kynä, which can mean pencil, pen or marker. To specify "pencil", you can say lyijykynä; lyijy means 'lead' (metal). To specify "pen", you can say mustekynä; muste means 'ink'. To specify "marker", you can say tussikynä; tussi means 'felt, marker'.