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:       The road ahead is blocked . There might have been an accident .  
 Person2:Are there many accidents in the city every day ?  
 Person1:        Not really , but they are on the rise .  
 Person2:Please drive slowly , we've got lots of time . Safety first . 

formal