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: Lucy sat at the police station. She'd been lost and a kind stranger brought her here. She sat with puffy swollen tear stained eyes waiting on her grandpa. An officer gave her a soda while she waited. 
 Sentence: She was so happy to see grandpa when he arrived, she knocked it over. 
 Character: Grandpa
to see lucy