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:       I heard there is a big yard sale at weeks this saturday morning , i will go there to see if there is some nice clothes , do you want to go with me ? 
 Person2:Well , i want to go to the university flea market , they got times of books , DVDs , and a lot of nice clothing , too . 
 Person1:        How about we go to the yard sale first and then to the university flea market ? 
 Person2:Good idea , let's shop to we drop ! 

informal