Definition: You are given a conversation between two people. 'Person1:' and 'Person2:' are used to separate their respective dialogues. You are required to assign a label 'formal' if there is an absence of emotion and a presence of questions anywhere within the conversation. If such pattern is not found assign the label 'informal'.
Input:  Person1:       What are you doing over the weekend , Sara ?  
 Person2:I'm planing to go balling tonight . Tomorrow I was hoping to see a movie . What about you ?  
 Person1:        I want to go camping , you know , just get a way for the weekend . I'm not sure I'll be able to , though .  
 Person2:Why not ?  
 Person1:        Well , I have a lot of work . I'll see how to goes . 

formal