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:       How can I get to Lakeside Park ?  
 Person2:Take the No . 7 bus . There's a bus stop just over there .  
 Person1:        Will it take me straight there ?  
 Person2:Yes . No need to change . 

formal