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'.

Person1: Welcome , Mr . Sun .
Person2:Thank you for your entertaining me .
Person1: Today I'll invite you to enjoy the seafood.Please make yourself at home .
Person2:Excuse me , what business are you looking after in Germany ?
Person1: I am running Chinese arts and crafts .
Person2:What arts and crafts are you interested in this time ?
Person1: I hope to import some silk from Hangzhou to Germany . Can you help me ?
Person2:Sure , I'll certainly help you do it .
formal