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:       I was thinking of holding the company retreat in the mountains .  
 Person2:I agree , I think that that would be perfect !  
 Person1:        I was thinking it could take place sometime in January .  
 Person2:That might be a little too cold for some people .  
 Person1:        Yes , you are right .  
 Person2:What about April ? April has good weather that isn't too cold or too hot .  
 Person1:        Yes , that would work out better .  
 Person2:You know , maybe we could take a survey to see how that works for everyone .  
 Person1:        Good idea ! We'll have to get right on it .  
 Person2:Fine ! Well , I'll get right on it now ! 

informal