It might seem counter-intuitive, but offering an escape when you ask someone for a favour will probably make them want to do it more. Photo by Fox Wu.
If you're not careful, people can get really annoyed with your favour requests. You need to be straightforward, understanding and even a little charming. More importantly, though, you need to be respectful. That's why Ross Mccammon at Entrepreneur suggests you always politely offer an escape right after you ask someone for a favour. For example, you could say "if you don't have the time, I understand" or "if you're not interested, no worries."
You might think people would jump at the escape, but it actually helps you. Offering an escape shows respect. Your request becomes more palatable because you're showing that you value their time and opinion. Remember, a favour usually means extra work for whoever you're asking, so be polite and show them that you're aware of that.
How to Ask for a Favour [Entrepreneur]