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:       I cannot stay here any more minutes .  
 Person2:What is wrong with you ?  
 Person1:        Tom is making so much noise . I have not a bit of peace and quiet all evening .  
 Person2:You can talk with him . 

formal