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:       Did you go to the concert last weekend ?  
 Person2:No , I didn't . And you ? Was it good ?  
 Person1:        Yes , I did . I enjoyed it a lot.There was a folk singer , a violinist and a pianist .  
 Person2:How much was the ticket ?  
 Person1:        I only paid two dollars for mine . 

informal