Depending on the ECV, you might be able to use it for 2 tickets. If the ecv ticket number is 012 027... then it keeps the residual value after using it. Then you can buy the second ticket on a seperate reservation using the residual of the ECV. If the ECV starts with 012 028 then it has no residual value. If it is none of the above then I need more information to tell you if it has value.

How much is the ECV for?