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:       Cheer ! 
 Person2:Cheer ! 
 Person1:        So what time tomorrow ? 
 Person2:Half past seven in the morning . 
 Person1:        Where to meet ? 
 Person2:In the market . 
 Person1:        OK . Bottoms up . 
 Person2:Bottoms up . 
 Person1:        It's on me . 
 Person2:Thank you . This place is nice . 

informal