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:       Your English has really improved in the two months you've been here , too .  
 Person2:Do you have to work late at the computer company again tonight ?  
 Person1:        No , I'm going to leave the office early today . My annual medical check-up is this afternoon .  
 Person2:How much longer will Mr . Schmidt be up in the mountains ?  
 Person1:        He's on a weeklong meditation retreat and won't be back until this weekend . 

formal