We're not here to do your homework for you. Do what you can and if you encounter a specific issue then ask a specific question about that and we'll be glad to help. Keep in mind that trying and failing is a big part of learning. The best way to learn is to do, so you do and then we can help you fix things if what you do doesn't work.
If you just want to delete a reservation, then see if you can build a function that deletes the contents of the text box or where ever the data is held. That should be a good starting point.
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