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:       I wonder if we can change to Channel 5 .  
 Person2:Why ?  
 Person1:        I want to know what's on that channel .  
 Person2:Oh , good .  
 Person1:        There is a football match .  
 Person2:I prefer TV play to football .  
 Person1:        OK . Could you turn it down ?  
 Person2:What are you going to do ?  
 Person1:        I'm going to listen to the radio .  
 Person2:Maybe we can enjoy the TV play together . It's interesting . 

formal