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:       Hi , Dave . You're early .  
 Person2:So you knew it was me ?  
 Person1:        I had an idea .  
 Person2:Look , before we get into the secret admirer thing , I want to talk to you about WebTracker .  
 Person1:        I'm sorry . I know you feel betrayed .  
 Person2:So you're really planning to quit invoking and switch over to WebTracker ?  
 Person1:        My mind is made up . 

formal