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:       Can you help me pick out a gift for my niece ? 
 Person2:Most normal little girls go wild over Barbie dolls . 
 Person1:        That sounds good . Let me see one . 
 Person2:Here's the latest model — Digital Barbie . 
 Person1:        Oh , she's nice . How much is she ? 
 Person2:Why , she's only $ 29.95 . 
 Person1:        Well , that's reasonable . I'll take it . 
 Person2:Excellent . Would you like anything else ? 
 Person1:        No , thank you . 
 Person2:The total will be $ 32.42 . Will that be cash ? 
 Person1:        Oh , cash will be fine . 
 Person2:Here's your change . Thank you for shopping with us . 

informal