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:       Hello . I'm answering the ad in the paper about your car.And I wonder if it is still available ?  
 Person2:Yes , it's still available .  
 Person1:        Good.Can you give me some information about it ... uh .. mileage and the tires and things like that ?  
 Person2:Well , it has got low mileage.The tires are in perfect condition and it's in excellent shape . 

formal