Place it at the end of the helpful moment, once the favour is clear, then follow it with Kids Cheering to celebrate the help, or put Oh My God Wow just before it when the help arrives as a surprise.
About this sound
This is a very short Polish voice clip, lasting under a second, in which a man named Jan says a brief thank you. The delivery is plain and direct, with no music or extra effects around the words. It feels polite and a little abrupt because it ends almost as soon as it begins, which makes the gratitude sound casual rather than formal.