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 have a good weekend ?  
 Person2:Yes , thanks . Did you ?  
 Person1:        Not bad . What did you do ?  
 Person2:I went to Tamshui . You ?  
 Person1:        I wasn't feeling too well , so I stayed at home . 

formal