1. A : hello sir, may i help you?
B : of course, i want a cup of mocha.
A : sorry sir, mocha have been sold out? do you want the other like coffee or cappucino?
B : oh, no ,thanks.
A : welcome sir
2. A : hello miss, what are you looking for?
B : i'm looking for a trouser
A : what kind of the trouser do you want? short trouser or long trouser?
B : the long one please.
A : okay, here you are.
B : thanks
A : welcome