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 I help you ?  
 Person2:Yes , would you like to tell me what's playing for tonight ?  
 Person1:        Sure . There is a folk concert tonight .  
 Person2:Are there any good seats left ?  
 Person1:        Sorry . There are only some seats in the back .  
 Person2:Well , what time does it begin ?  
 Person1:        It begins at 7 p . m ..  
 Person2:OK . I see .  
 Person1:        How many tickets do you want ?  
 Person2:Just two .  
 Person1:        OK . Fifty yuan for each .  
 Person2:Here is the money . 

formal