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:       What a washing machine ! It ’ s getting worse today . Look ! Now it doesn ’ t work at all . I think I need a new one .  
 Person2:Here ’ s an ad . about a big sale of washing machine . Do you want to see it ?  
 Person1:        Of course ! Let ’ s have a look . Great ! In my frame of mind , I ’ d like to buy one today . 

informal