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:       In my opinion , it may be necessary to charge for participation .  
 Person2:I'm not sure if that would be wise .  
 Person1:        Then what is your opinion ?  
 Person2:Well , maybe we'll go to ask Mr . Johnson . He has the final say . 

formal