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:       Has Alan shown up yet ? 
 Person2:Nope . I guess something might have come up . 
 Person1:        I wonder what happened . 
 Person2:I don't know . I hope it's nothing serious . 
 Person1:        Last week his sister was admitted to the hospital . 
 Person2:Oh ? What happened ? 
 Person1:        His sister had a car accident last week . 
 Person2:Is she fine now ? 
 Person1:        She is still in a coma . 
 Person2:Oh , poor Alan ! His sister is the only one he has left since his parents died last year . 

informal