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:       Are you being served , madam ?  
 Person2:Not yet .  
 Person1:        Sit here please.How would you like your hair done ?  
 Person2:A trim and perm .  
 Person1:        Do you want a cold-wave or perm ?  
 Person2:A cold-wave , please . 

formal