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:       Hi , Mike , what gives ? 
 Person2:Hi , Bill , this is my new car . 
 Person1:        Hey , great set of wheels . 
 Person2:You like it , huh ? 
 Person1:        Who wouldn't ? Wow , that's out of this world . 
 Person2:It is special , isn't it ? 
 Person1:        Yeah , too cool . How much did they sold you for ? 
 Person2:Lots . Looks like I'll have to moonlight for the next two years . 
 Person1:        I can imagine . 
 Person2:Hey , let's go for a spin . You can try it out . 
 Person1:        I'd love to . 
 Person2:Ok , let's go . 

informal