Hello I am looking for a place but my budget may be too tight for 4500..
Hi there. What do you have in mind?
Well my ideal is 3100 but I understand that's quite a ways off from your asking price but maybe we can work something out?
Well I am willing to give it to you for that provided you agree to doing volunteer work around the area? It can make up for me. 
That should work out fine for me because my job is quite lenient on my hours.  So this will work out fine I think, what kind of work do you need help with?
Its like 30 hours a week. You just need to be around the pool area to be sure everything is fine
Awesome that sounds great, let's get started!
Great! Good to have business with you :)