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:       Do you sell washing machines ?  
 Person2:Yes . We ’ re having a special sale on this machine here .  
 Person1:        Is that a Danish machine ? The name looks Danish .  
 Person2:No . It ’ s Swedish . Would you like me to demonstrate it for you ?  
 Person1:        Sure . I ’ d like to see how it washes . 

formal