How to end a casual conversation?

How do you end a casual conversation, especially at work? More than once, I’ve come across responses as unintentionally curt as ‘Okay bye.’ So I thought of posting some phrases you could use.

‘Well, I have to get back to my desk../my break is over…let’s catch up soon again’
‘I’m sorry, I have to go/leave/get back..’
‘I’m sorry I have to go now, but let’s talk more this afternoon.’
‘It was nice/good/interesting/a pleasure talking to you.’
‘Oh I have to run to the meeting now, but let’s catch up later.’
‘I enjoyed talking to/meeting/chatting with you.’
‘I have another meeting in ten minutes. Can we wrap this up now?/Can we finish this later?’