Hello Friends

I have a spread sheet with two values – say like this

City Number City Name

100 Athens
101 Bucharest
102 Copenhagen
103 Dhanbad
104 New Delhi
105 Toronto
106 Las Vegas
107 Las Angeles
108 New York
109 Denver
110 Buffalo
111 Chennai
112 Bangalore

I want the user to input the City number and in the adjoining cell the name of the city should come up. Can someone tell me how I do this ?

Thanks for your help, as always.