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:       Our unit is participating in a fundraiser this weekend and would like to borrow the van , if possible .  
 Person2:I would need to check on that . Where is the fundraiser ?  
 Person1:        It will be at the beach by the pier .  
 Person2:What day will you need it for ?  
 Person1:        We will only be needing it for Sunday .  
 Person2:Maybe that could work . I need to know who will be driving it .  
 Person1:        The only two drivers will be Mary and I .  
 Person2:If I give you the keys to the garage , could you bring it back on Sunday evening ?  
 Person1:        Sure . We also would like to use the chairs from the lunchroom . Would that be OK ?  
 Person2:OK , but make sure that everything is back by Sunday night at the latest . 

formal