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 have desserts ? 
 Person2:Yes , we have many kinds of pies and puddings . 
 Person1:        Can you give us more information ? 
 Person2:Sure . We have lemon pies , apple pies , coffee rum pies and ice cream . 
 Person1:        I would like to have the coffee rum pies . 

informal