How to end a date that isn't going well?

When you go on a date and you know quite soon that it isn't going well at all, how do you initiate the ending?

Also, if it isn't so bad, but you don't want another date, how do you refuse when they ask you during the meeting?

I don't want to ghost anyone but also don't want to spend a long time sitting there and conversing politely when I know it isn't working out.

How to end a date that isn't going well?
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