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:       And what's your vision ?  
 Person2:20/350 .  
 Person1:        Mine's 20/20 . Life just isn't fair , is it ?  
 Person2:Oh , yes , it is .  
 Person1:        What do you mean ?  
 Person2:You'll find out when we're in the woods and you have to go to the bathroom ...  
 Person1:        They don't have toilets at the campground ?  
 Person2:Let's just say I'll have it easy ... 

formal