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:       Hectic . It's always hectic . But how was your windsurfing ?  
 Person2:I tried it for a half-hour.It was interesting , but ... well ... I couldn't really do it .  
 Person1:        See ? I told you . It's very hard .  
 Person2:I couldn't even stand on it and hold the sail . I probably fell down fifty times .  
 Person1:        Fifty times ?  
 Person2:Yes , it was really stupid .  
 Person1:        And how much did it cost to rent it ?  
 Person2:It was fifty dollars for a half-hour .  
 Person1:        Well , that's not too bad then .  
 Person2:What do you mean ? It's expensive !  
 Person1:        Yes , but you have to calculate a little.You paid fifty dollars and you fell down fifty times.So you only spent one dollar per fall . That's cheap . 

informal