In Alberta, a real estate offer can be rescinded or withdrawn by the buyer before it is accepted by the seller. Once the offer is accepted, it becomes a binding contract and cannot be rescinded without the consent of the seller. If the buyer wishes to withdraw their offer, they should do so in writing as soon as possible.
It's also a good idea to consult with a lawyer to understand the legal consequences of withdrawing an offer. If the seller has already incurred expenses due to the offer, the buyer may be liable for those costs. Additionally, if the property is in high demand and the seller receives another offer, they may choose to accept the new offer instead of allowing the buyer to withdraw.