====== Steve: Core and Value-added Service of convenience Stores ======
Both are simillar so I just made one list.

Core:
  - Selling things.
  - Taking money.
  - Tell you where things are placed in the store.
  - Tell you if there are any special offers.

VAS:
  - Top up travel card.
  - Making withdrawals.
  -  Making drinks.
  - Offering lucky draws.
  - Offers directions to somewhere.
  - Ice cream, cooked food.
  - Air conditioning.
  - Items ordered online can be collected there.
  - Packages can be sent there.
  - Seating, tables.
  - Reusable cups.
  - Providing Eating utensils.
  - Providing tissue.