Instructions: 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:       Have you heard we'll have a pay rise ?  
 Person2:Oh , it has nothing to do with me .  
 Person1:        It's a pity , but why ?  
 Person2:I came here only a month ago . 
Output:
formal