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:       Shall I get you another cup of coffee ?  
 Person2:Yes , please . That is very kind of you .  
 Person1:        Shall I make more sandwiches ?  
 Person2:No , thanks . I ’ Ve had plenty . 

informal