Tried to add 4th night as described in post 41. Didn't work. Three nights booked (and they are no more available). The 4th night to be added is available. When tried to change the reservation, the system asked for the dates for the new reservation. When highlighted 4 nights, it stopped asking to call customer service. I can not see button to continue.
The question is do all four nights need to be available to make a change from 3 to 4 nights, or just the 4th night needs to be available?
Thx