c++ a room from the class reservation to assign reservations [closed]

everyone, I would be happy, and very grateful, if someone would help me with this. this is something like a reservation system. you book rooms from a certain time to a certain time. It can also be canceled.

where i have a problem is i don't know how to match reservations to rooms

if you look at the class diagram, you'll understand better what I mean. i'm afraid i'm not that good at describing things.

thank you for any help. enter image description here