In this task, you're given a context, a sentence,  and a character. The sentence describes an action or job of the given character. Also, the context provides more information about the sentence or the character. Your task is to write the character's motivation by doing a specific job, which is given in the sentence. You can use context to find the motivation; however, all the inputs do not provide context. Also, in some inputs, there can be zero motivation; output, 'None' in this case.

Context: Ron ordered delivery pizza and was looking for his wallet to pay. The delivery guy knocked on the door but Ron couldn't find the wallet. Ron apologized and asked the pizza guy to wait a minute. The pizza guy shows him a wallet he found in the driveway. 
 Sentence: Ron thanked him for finding the wallet and gave him a huge tip. 
 Character: Ron
to repay the pizza guy