Student B is a potential client who has spent the day visiting your company. Your colleagues have booked a table at a restaurant for dinner. Invite him and say when and where the table is booked. Offer to pick him up from the hotel
You are a colleague of Student B's in a different branch. You are spending the day in meetings at Student B's branch. You have a very busy day, but are free in the evening
You are a potential client of Student A's. You have spent the day at his company
Student A is a colleague at a different branch and is spending the day in meeting. Invite him to lunch. Offer to help with any work Student A has to do. Try to find a time when you can meet for a meal or a drink.