Beginning / ending conversations - questions / statements and responses	

How's it going?	Can't complain.	
Right, I'm off.	Hang on. Where are you going?	
What have you been up to?	Nothing much. This and that.	
See you around.	Yeah. Give us a ring sometime.	
It was nice talking to you.	Yes it was. Take care now.	
I guess I'd better be going.	Yeah, I'd better make a move too.	
Talk to you later.	Right-O. See ya.	
How are things?	Not so bad. Busy...	
It was very nice meeting you.	Yes, indeed it was. We must stay in touch.	
We must do this again sometime.	Yeah, definitely. I've really enjoyed it.	
Haven't seen you for ages.	Well, I've been away since Christmas.	

Notes

'It was very nice meeting you.'
'Yes, indeed it was. We must stay in touch.'	First meeting. Rather formal tone.	
We must do this again sometime.
Yeah, definitely. I've really enjoyed it.	Following a specific occasion - a meal, hiking trip etc.	
Haven't seen you for ages.	'Ages' is a relative term. Depending on the situation it could mean years, months, weeks or even days.