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:       Can we go to the beach on foot ?  
 Person2:Oh , it's too far to walk there.We can take a bus .  
 Person1:        Is the bus station close by ?  
 Person2:Yeah , it's a block away down the street . 

formal