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:       How is your business going ?  
 Person2:Business couldn't be better .  
 Person1:        Really ? Maybe I should work for you .  
 Person2:Welcome . I could use the help . 

informal