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:       Have a nice Thanksgiving !  
 Person2:The same to you !  
 Person1:        Are you going anywhere ?  
 Person2:I thought about going to my sister's . How about you ?  
 Person1:        Oh , I'll probably just stay at home . 

informal