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:       Good afternoon . Can I help you ? 
 Person2:Is it possible for me to buy some RIB at this counter ? 
 Person1:        Of course , that's no problem at all . 
 Person2:That's a relief ! I was a little worried about it ; I left England in a bit of a hurry . 
 Person1:        How much would you like to change ? 
 Person2:Well , I'm only here for 3 days , so I think 500 GAP should be plenty . 
 Person1:        Please fill in this exchange form , and I'll need to see your passport , and sign here . That's the money and your passport back . Of course , if you don't spend all of it , you can come back and we'd be happy to buy the local currency back from you . 

informal