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:       Hi , Mark ! Hi , do you have a minute ?  
 Person2:Oh , I'm sorry , Nigel . I'm rushing to a meet right now .  
 Person1:        Sure , no problem . Can we fix a time to talk later ?  
 Person2:Sure , but this week is crazy for me . Can we make it next Monday ?  
 Person1:        Ok , see you 10 o'clock next Monday !  
 Person2:That's fine . See you then . 

formal