There are lots of mistake in your code.
First-- Use the following code instead of your version in Reservation class
System.out.print("Enter number of guests:(Max of 4 per room) ");
int guests = scand.nextInt();
String[] guestName = new String[guests];
for (int i=0;i<guestName.length;i++) {
System.out.print("Enter guest names: ");
guestName[i] = scand.next();
}
Second -- Use the following method in Room class instead of the existing one.
public void setguestName(String[] guestName)
{
for (int i=0;i<guestName.length;i++)
this.guestName[i]=guestName[i];
}
Let me know what you achieve