Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
Which Servedby has a Local authority [a ] of thurrock, and a Station of ockendon?

### Inputs:
table_name: table, columns: ['Station', 'Local authority [a ]', 'Servedby', 'Station users 2004–05', 'Station users 2005–06']

### Response:
SELECT Servedby FROM table WHERE Local authority [a ] = thurrock AND Station = ockendon