this is a copetition socity, and now it's not very easier to find a better job, since you have found one spare job, and you have met some problem, such as your customer ask you supply special sevice, in fact, this is a very common, because there are many richer people with poor knowlege, so he want to get more culture from you, but it's impossibel now. since you have met this problem, I think skill is very importance. At first, you should know you are guider, and he has pay for money to you, and he has become your customer, you have to inspect to him,that's to say" Customer is god". When your customer ask special question, you can confidence say: I am very glad that you can become one of my customer, and hope make a friend with you. I will try my best to let you have a happiness travel, but I am really sorry we can't accept your under manner language or action.

唉~就是这么无奈