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:       There's a new play tonight .  
 Person2:What's its name ?  
 Person1:        ' Romeo and Juliet ' .  
 Person2:What is it about ?  
 Person1:        It's about their great love .  
 Person2:Sounds interesting .  
 Person1:        Of course . Do you want to see it ?  
 Person2:Yes , do you have tickets ?  
 Person1:        No , I don't .  
 Person2:Let's go to the theater and buy two tickets now , shall we ?  
 Person1:        Good idea . Let's goa  
 Person2:OK . Let's go . 

informal