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:       Dad , you keep talking about family in New Zealand . Who are they ?  
 Person2:Well , that's your uncle Bill , his wife and two of their daughters .  
 Person1:        Is uncle Bill your brother ?  
 Person2:No , your uncle Jack is my brother , Bill is my brother-in-law , your mom's brother .  
 Person1:        So his two daughters are my cousins ?  
 Person2:That's right , Sarah and Jane are both your cousins although they are step-sisters .  
 Person1:        What are step-sisters ?  
 Person2:Sarah is your uncle Bill's older daughter . When she was young , Bill's first wife , Sarah's mom died . Three years later Bill married again .  
 Person1:        So uncle Bill's wife is Jane's mother but not Sarah's mother . Right ?  
 Person2:Yes . She is Sarah's step-mother .  
 Person1:        And when are they coming to visit us ?  
 Person2:They want to travel to Europe next year , and will visit us at the same Ae . 

formal