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:       What a beautiful sweater !  
 Person2:Do you think it looks good on me ?  
 Person1:        Yes , and it goes beautifully with your pants .  
 Person2:You won't believe it , but it was really cheap .  
 Person1:        I wish I could find one just like it . 

informal