If you don’t want to continue, say thank you have a good night. It’s important not to say something that leads ur date to think you enjoyed if you didnt, at the same time one should be respectful.
If you enjoyed, tell ur date! “hey I just want you to know that I really enjoyed spending time with you” or in your own words.. Point is if you enjoyed tell them so they know, this helps decisions and it’s more personal than hearing it from the Shadchan “he/she enjoyed the date.”