Yes of course, there are several ways to do that:
- "I would love to work on your project but at the moment I have very limited time and I can't take other orders, but thank you for your interest"
- "I checked your project but I'm not sure if I have the capabilities to deliver a satisfactory result, therefore I prefer to not take this order"
- "I'm sorry but unfortunately I do not provide this type of service..........." (here you must find something specific that you won't do, each case a different story)
- Or if you find a very impolite person just leave the conversation at some point.
No I don't have "request to order", but that happens very rarely in my case, 90% of my clients always contact me first, so with automatic orders you just have to deal with and ask as much as you can in this case.