About expedia.co.uk... the name of travellers does not match the name of pports?

i phoned expedia up and told them that a middle name wasnt included on my confirmation letter (the one u take to the airport to show you`ve paid for the flights) well apart from the middle name missing the first and last name are correct. What im trying to say is, will easyjet have any problems with this? on the pport it has name including middle. however on expedia confirmation letter it just his first and surname. thanks :)