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:       What bus can I catch to get to the Gold Line ?  
 Person2:Tell me where you live .  
 Person1:        I live in Altadena .  
 Person2:You can catch the 264 .  
 Person1:        It goes to the Gold Line ?  
 Person2:Yes , it does .  
 Person1:        What street do I go to to catch it ?  
 Person2:You can catch it on Altadena Drive .  
 Person1:        I had no idea that bus went to the station .  
 Person2:Yes , it does .  
 Person1:        I'm glad you told me .  
 Person2:You're welcome . 

informal