Hey there.  I'm interested in your bike.
Hi. Thank you for your interest. Did you have any additional questions?
I'll pay you $50 in cash tonight for it.
If you can pick it up before 5 pm I could do that. Need to drive my girls to dance lessons at 5.30.
Not a problem! I'll have your $50 and see you around 4:30?
Sounds good to me.