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'd like to have these shirts washed and ironed .  
 Person2:Ok , do you want us to use starch ?  
 Person1:        Yes , heavy starch in the collar , please .  
 Person2:Yes , sir . Your shirts will be ready by Thursday morning . Anything else ?  
 Person1:        I also have a suit to be dry-cleaned . Can I fetch it the day after tomorrow ? It's urgent .  
 Person2:No problem , sir .  
 Person1:        Could you please tell me when your laundry opens and closes ?  
 Person2:We remain open from 9am till 8p m .  
 Person1:        I see .  
 Person2:Here is your laundry ticket , sir .  
 Person1:        Thank you . I'd like to get my laundry .  
 Person2:Yes , sir . May I have your laundry ticket , please ?  
 Person1:        Here you are .  
 Person2:Yes , they are ready to go .  
 Person1:        Can you sew on these buttons ?  
 Person2:No problem .  
 Person1:        How much for the shirts ?  
 Person2:10 dollars .  
 Person1:        Here is the money , keep the change .  
 Person2:Thank you , bye . 

informal