Riddle 2

The scene was merry, bright and gay
As I came to my first one day.
Beside my last I saw a lass
Dispense refreshment in a glass.
She was my first. “My last,” said I,
“I ’ll take a drink, for I am dry.”
Smiling, as she the goblet passed,
She said, “Here you my first my last.”
“My whole,” said I, “ere I depart,
I ’ll say that there is in my heart
(Just here the word must be reversed--)
A wish for your my last my first.”