Réponse:
You - Hello! I would like to buy some meat and some tomatoes with lettuce.
ShopKeeper - Hello, of course! Also, may I ask why do you need those?
You - Oh! My mom wants to make some Couscous but she forgot the meat and the vegetables, so I'm bringing some for her!
Shopkeeper - Ohh that's really nice of you! Here you go!
You - Thanks you! Have a nice day!
Shopkeeper - Thanks you too! Bye!