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:       Well , Jeff , that was a very productive meeting , I thought . You had some really great ideas in there !  
 Person2:Really ? Well , thanks for saying so .  
 Person1:        No , I mean it . Look , are you hungry ? Shall we go get something to eat ?  
 Person2:Sure . Why not ?  
 Person1:        OK , well , let me just get my coat and we'll go to the diner around the corner .  
 Person2:OK . 

informal