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:       Hey , Philip ! You won ’ t believe this !  
 Person2:What ? What ’ s the good news ?  
 Person1:        My son , Harvey just got into Harvard ! He starts next September .  
 Person2:That ’ s wonderful ! You must be really proud of him ! 

informal