根据对话内容，选用would或could完成对话

John： you like some more coffee, dear?

Jane：No, I don't think so. Let's get the bill(账单).

John：OK. Waiter(服务员), excuse me,  you bring us the bill please?

Waiter：Here you are, sir.  I take the plates away?

 John：Sure, Thank you. I have a pen to write my name?

Waiter：Sure. By the way,  you like me to get a taxi for you, sir?

John：Yes, thanks.