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'd like to subscribe to a magazine . 
 Person2:What magazine do you want to subscribe for ? 
 Person1:        Fitness Consultant . 
 Person2:OK , Fitness Consultant . How many subscriptions do you want ? 
 Person1:        Only one , please . 
 Person2:How long do you want the subscription for ? 
 Person1:        For six months , please . 
 Person2:Your name , please ? 
 Person1:        Shirley , that's my wife's name . I subscribe to this magazine for her . 
 Person2:I see . Please put your address here then . 
 Person1:        OK . How much is the subscription ? 
 Person2:650 Yuan . 
 Person1:        650 Yuan ! You must be kidding ! I can subscribe for evening newspapers for ten years with that much ! 

informal