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:       Mr . Clinton , it's nice to see you again . 
 Person2:Nice to see you again , too . Peter . How's your family ? 
 Person1:        Very well . How's Mrs . Clinton ? 
 Person2:Not bad . But she's as busy as before . 

formal