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 was wondering if I could borrow the company van for a fundraiser this weekend . 
 Person2:Sure , I think that would be possible . Where is the fundraiser ? 
 Person1:        It is in the park downtown . 
 Person2:Would you need it for both Saturday and Sunday ? 
 Person1:        We will need it for Saturday only . 
 Person2:I think that would be OK . Who will be driving it ? 
 Person1:        Mary and I will be driving the van . 
 Person2:Could you drop it off on Sunday night ? 
 Person1:        Yes , we can do that . Can we borrow the chairs from the lunchroom also ? 
 Person2:Yes , that would be fine . Just make sure that everything is returned by Sunday night . 

informal