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:       That is the most beautiful sunset !  
 Person2:Let's stop the car and enjoy it for a minute .  
 Person1:        Here is a good place . Let's get out .  
 Person2:Wow . We don't get to see this in the city !  
 Person1:        Mother Nature is quite an artist .  
 Person2:Look behind us at the mountains ! They're reflecting pink !  
 Person1:        Amazing . The sun is almost gone and yet there is still color everywhere !  
 Person2:Where is our camera ? Let's see if we can catch this on film ! 

informal