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:       Guess , what I ’ Ve bought for you .  
 Person2:Oh . it ‘ s a case flowers . It ’ s very kind of you .  
 Person1:        I hope you like it .  
 Person2:I love flowers you know . Thank you very much .  
 Person1:        that ’ s all right . 

informal