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:       Laura , what are you going to do today ?  
 Person2:I'm going shopping .  
 Person1:        What time are you leaving ?  
 Person2:I'm going to leave around 4 O'clock .  
 Person1:        Will you buy a ham sandwich for me at the store ?  
 Person2:OK .  
 Person1:        Do you have enough money ?  
 Person2:I'm not sure .  
 Person1:        How much do you have ?  
 Person2:25 dollars . Do you think that's enough ?  
 Person1:        That's not very much .  
 Person2:I think it's OK . I also have two credit cards .  
 Person1:        Let me give you another ten dollars .  
 Person2:Thanks . See you later .  
 Person1:        Bye . 

informal