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:       We have a holiday next week , don't we ?  
 Person2:Yes , on Monday .  
 Person1:        What're you going to do ?  
 Person2:I'm probably going to spend the day looking at cars .  
 Person1:        At cars ! You aren't thinking about buying a car , are you ?  
 Person2:Yes , I am . I'd like to be able to get around a little more .  
 Person1:        But it will be expensive to have a car in the city , won't it ?  
 Person2:Oh , I don't know.Of course , gasoline costs a lot these days .  
 Person1:        But what about parking ? You can't park on the street , can you ?  
 Person2:A lot of people do . I'll try it for a while anyway , but I certainly don't want to pay a lot of parking tickets . 

informal