Good afternoon , madam . Is there anything I can do for you ?   Yes , I spent so much time sightseeing here . It is already so late now . I am afraid I can't catch the last bus back to downtown .   Don't worry . I will try to get a taxi for you . You can take it to the bus station .   I am very grateful to your help .   Don't mention it . It is my duty .   Thanks again . 