我建议你改成这样：
J:What can I do for you?
S:I want a pair of shoes .
J:What about this one?Wearing leather sandals fits right now.Would you like to try it?
S:Alright.
S:Can I have a larger size?These pinch my toes.
J:Sure, Let me show you.
S:Oh, beautiful! I think I prefer the blue one if that's not too much trouble.
J:Not at all. I’ll get it for you. Here you are. This is our latest design.
S:Could I have a try?
J:Certainly.
J:It seems to fit you very well.
S:Alright. I think I’ll take it.
S:How much does it come to?
J:It comes to two hundred and fourty dollars.
S:Could you give me some discount?
J:That’s almost cost price.But we can give you $30 for coupons.
J:Do you think that is ok?
S:OK,Go ahead and ring it up for me.
L: Looking forward to serving you next time
如果有什么问题尽管问我 ^-^