Let's say you reserve a time slot and then your partner gets confused because he doesn't see anything confirming the date for him. He then ends up panicking and reserves an earlier time slot -.-. So now we have two different times on the same day.

Is there a way to cancel one of them? I'm assuming we have to take his time slot if not. Because if we miss it we'll be asked to reschedule. Be nice to free up a spot for someone else as well.