There was a mixup when buying the tickets, is it possible to split a time slot between us 2???

As far as I know, single tickets/ slots are per person, you pay per person up to a group which I think qualifies as 6 or more to get a discount. However, if your willing to share your timeslot, I'm sure that can be arranged, given that there is room for another person technically "unpaid" I would definitely call in though too.

Call a d ask them

iFly