What is the 24 hour rule for****? #KLM Help

KLM's 24-hour rule allows you to cancel+????-????????????-????????????-???????????????? your F????ight reservation or make changes to your booking+????-????????????-????????????-????????????????within the first 24 hours of purchase without any penalty fees, as long as your Flight is at least 7 days away.
 
KLM's 24-hour rule allows you to have queries on reservations, booking+????-????????????-????????????-???????????????? within the first 24 hours of purchase without any penalty fees, as long as your Flight is at least 7 days away. To cancel or change your reservation, call**** at +????-????????????-????????????-???????????????? OR +????-????????????-????????????-????????????????.