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:       Here is the song list .  
 Person2:Do you have any English songs ?  
 Person1:        Yes , here you are .  
 Person2:Let me have a look . Everything I do I do it for you 、 Unchained melody 、 My heart will go on . Oh , and I ’ d like to try Everything I do I do it for you .  
 Person1:        Let me play it for you .  
 Person2:Is it easy to locate it ?  
 Person1:        It's very easy . Here it is . Ready ? Excellent ! You are a good singer . You sing the bass so well .  
 Person2:I used to be a better singer . I haven't sung in the Karaoke for a long time . It's your turn .  
 Person1:        I'll sing a Chinese folk song Love song of Hanging , first in Chinese then in English .  
 Person2:That's really my pleasure to listen to a Chinese song . 

informal