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:       Dodge Automobiles , may I help you ?  
 Person2:Is this Susan ?  
 Person1:        No , I'm the operator .  
 Person2:Oh well , do you know if the Susan Li is available ?  
 Person1:        One moment and I'll check . 

formal