[header] How to say thank you [title] Be sincere. [step] The most important part of saying thank you in person is being sincere. The person you are thanking should understand that you mean what you say 100% and that you aren't just saying " thank you " out of obligation when you don't really mean it. 
Here's how to do it : [substeps] Have a sincere tone of voice. Don't say " thank you " as if it's an afterthought or as if someone else just told you to do it.