I am trying to book reward business flights for April 2019 next year with my velocity points converting to Krisflyer. I have been playing with destinations and dates and can get us to Cairo on the way there early April but want to come home via an alternate destination such as Rome or Istanbul. There are lots of dates on waitlist. I am worried about not being approved for 2 business fares. What is the likelihood? How much of a risk would I taking? Any advice would be appreciated.