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:       Excuse me . Could you give me some directions ?  
 Person2:What are you looking for ?  
 Person1:        A gas station . My car ran out of gas two blocks back .  
 Person2:Walk straight ahead until you come to the second traffic light . Then turn right .  
 Person1:        Do you know the name of the street ?  
 Person2:I can't remember , but it's the second light .  
 Person1:        By the way , do you know the price of the gas now ?  
 Person2:I'm afraid I don't . But I do know the price has gone up .  
 Person1:        Thanks a lot . 

informal