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:       Would it be all right if I went home next weekend ?  
 Person2:For What ?  
 Person1:        Well , I want to surprise my brother showing up for his birthday .  
 Person2:Well , that sounds like it would be OK . Just be careful . 

informal