Below is an instruction that describes a task, paired with an input that provides further context. Write a response that appropriately completes the request.

### Instruction:

Convert text to sql: Show names for all employees who have certificates on both Boeing 737-800 and Airbus A340-300. | flight : flno , origin , destination , distance , departure_date , arrival_date , price , aid | aircraft : aid , name , distance | employee : eid , name , salary | certificate : eid , aid | flight.aid = aircraft.aid | certificate.aid = aircraft.aid | certificate.eid = employee.eid | 

### Response:

select _ from _ where _ intersect select _ from _ where _ | select employee.name from employee join certificate on employee.eid = certificate.eid join aircraft on aircraft.aid = certificate.aid where aircraft.name = 'Boeing 737-800' intersect select employee.name from employee join certificate on employee.eid = certificate.eid join aircraft on aircraft.aid = certificate.aid where aircraft.name = 'Airbus A340-300'