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:       How do you celebrate Thanksgiving in the US ?  
 Person2:Well , Thanksgiving is family event.So on Thanksgiving , family members will get together and enjoy a big Thanksgiving dinner . Kids will have lot of fun .  
 Person1:        Do you say prayers before dinner ?  
 Person2:Yes , we do . It is an exciting moment .  
 Person1:        What is the biggest fun for you on Thanksgiving ?  
 Person2:For me ? The football games of course , I love football games . 

informal