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:       I'm thirsty . Pull over to that store , I'll buy some drinks .  
 Person2:I'm afraid I can't . Parking is not allowed here .  
 Person1:        Oh , that's too bad , Where can you park around here ?  
 Person2:There is a square in front of us . We can park the car there .  
 Person1:        Is a shop there ?  
 Person2:I'm not sure , you know I'm not familiar with the city , too . 

formal