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:       Before we begin eating , I'd like to present everyone with a gift from Taiwan . 
 Person2:What is it ? 
 Person1:        It's a Taiwanese puppet doll . 
 Person2:It's huge ! 
 Person1:        Yeah . They're usually this big . 
 Person2:The craftsmanship is excellent . 
 Person1:        All the parts work . 
 Person2:Thank you so much . 
 Person1:        Don't mention it . 

informal