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:       Did you know that drinking beer helps you sing better ? 
 Person2:Are you sure ? How do you know ? 
 Person1:        Well , usually people think I'm a terrible singer , but after we all have a few beers , they say I sound a lot better ! 
 Person2:Well , I heard that if you drink enough beer , you can speak foreign languages better ... 

formal