It isn't a dinner party, it's just an informal get-together.
Can I pour you some juice?
Help yourself to some nibbles. (biscuits, crisps, snacks etc before meal)
I have a sweet tooth and can never say no to pudding or custard but I'm afraid I have to count the calories.
The service at the restaurant was quick. Also, the waiters were courteous without being overbearing.
Will you join us for dinner?
We'll split the bill, shall we?
But lunch is on me today. (I am paying today)
Here the waiters tend to be sullen (bad-tempered, unwilling to smile) and service is rather brusque (quick and rude), which I find very off-putting.
Let me get this. (Let me pay the bill this time)
We can grab a bite to eat on the way. (quick meal)
Or we could get a takeaway when we get there. (cooked meal to be taken home)
Does anyone want seconds (second serving)?