Dahlia instructed Syazwan to sell an antique poster bed belonging to her grandmother. Syazwan received an offer from Harith to buy the bed at the price of RM35,000. Syazwan's sister, Cahaya also expressed an interest in the bed and offered to buy it for RM30,000. Syazwan accepted Cahaya's offer of RM30,000 and in gratitude, Cahaya gave Syazwan a new watch. Syazwan did not inform Dahlia about his relationship with Cahaya.

A week later, Dahlia met Harith who informed her about his offer to buy the bed for RM35,000. Dahlia subsequently learned that Cahaya is Syazwan's sister.

Dahlia is unhappy with Syazwan's action and seeks your advice on her legal rights against Syazwan.

Which part is in agency that the question implied to? I am quite confused. I hope you can give me throughout explanation regarding this question. Thank you!