Custom search bar with page list

Hello,

I’m building a WordPress website about tourism for a travel agency. I want to have a search bar on the landing page in which people can input a country name and a list will appear and display the corresponding countries. I don’t want to let people do a search on any country, only the ones listed on the website should appear.

Others have this kind of functionnality already, like this website :
https://www.amplitudes.com

I don’t know which plugin I need to do this, any ideas?

Thanks for help!