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:       A friend told me I might find a room here .  
 Person2:Yes . I ’ ll have a room free next week .  
 Person1:        What do you charge ?  
 Person2:25.00 dollars a week , but you can't have visitors .  
 Person1:        Fine.Would it be OK to look at the room ?  
 Person2:Could you come back later ? We ’ re right in the middle of dinner . 

formal