dialogue b
a： excuse me. where can i buy some cigarettes？
b： there is a shop on the ground floor. it sells both chinese and foreign cigarettes.
a： can i also get some souvenirs there？
b： yes, sir. there is a counter selling all kinds of souvenirs.
a： by the way, where is the men's room？
b： there is one at the end of the corridor.
a： thank you.
b： you are welcome.