根据对话内容,填入适当的句子或单词,使对话完整,合乎情理.
A:Can I help you?B:Yes,please.Today is Mother's Day.I __ a present for my mother,but I have no idea what to buy.A:Maybe you can buy her some flowers.B:Great!But ___ shall I buy,roses or carnations?A:I think carnations are better.They __ happiness,sweetness and love.They are for mothers.B:___ are they?A:Thirty yuan a bunch.B:OK.I'll take it.___.A:Thank you,and best wishes to your mother.