Starting and ending conversations	

Hi	a nice weekend.	
I've got 	you doing?	
See you	up?	
How's 	later.	
How are 	you later.	
See you	there.	
I guess I'd	dash.	
Have	talking to you.	
What's	it going?	
Right, I must	better be going.	
Talk to 	around.	
It was nice	to go.	

Answers	

Phrase	Function	Notes	Register	
Hi there.	greeting		spoken / informal	
How are you doing?	greeting / inquiring after health etc.		spoken / informal	
How's it going?	greeting / inquiring after health etc.		spoken / informal	
What's up?	greeting / inquiring after health etc.

	* Can also mean, 'What's the matter?' when someone seems unhappy or unwell	spoken / informal	
				
See you around.	Ending / leaving

	You expect to see the person again but not at any specific time.	spoken / informal	
I guess I'd better be going.	Ending / leaving		spoken / informal	
I've got to go.	Ending / leaving		spoken / informal	
It was nice talking to you.	Ending / leaving		spoken / informal	
See you later.	Ending / leaving
	You expect to see the person again soon	spoken / informal	
Right, I must dash.	Ending / leaving
	More urgent	spoken / informal	
Talk to you later.	Ending / leaving

	You expect to see the person again soon	spoken / informal	
Have a nice weekend.	Ending / leaving		neutral