I need an angel...!

My Christmas play seems to be fraught with obstacles and obstacles. Now its the angel who is giving me sleepless nights.

There were absolutely no fitting child in the preschool to play the angel's role so after a rigorous hunt I managed to make do with a little 4 year old girl from the smaller group and after one and a half weeks' hard work just when I was succeeding in getting the dialogs correctly out of her she scampered off on a long 2 week vacation without even telling me.
I took another little girl but she is completely hopeless. She says her lines in an inaudible whisper and makes the action of flying as if she were actually beating someone mercilessly.
My eyes fell on a cute little British boy whose little sister is in my group but do what I will, he clearly refuses to be in the play. He simply says, ' I don't want to be in the play." His mother tried her best to coax him into this and he finally agreed.
"Oh, I am so glad, you have agreed to act in the play." I said giving him a chocolate.
I have not agreed yet; I have only agreed to give it a try." He said fully seriously.
Then I took him with me to say the dialog ' Don't be afraid Mary, I am an angel.", but he didn't say at all. He kept asking me,' Who is Mary?. But she is not Mary, she Elizabeth. Why should I call her Mary when she is Elizabeth?"
The next day when I again took him for practice he refused to say his line saying, " I do not want to say my lines in such a crammed room. You tell me that the play will be done on a stage. Where is the stage? I want to speak my dialogs on a stage in a big room."
Yesterday, he was again up to his evasive tantrums. I was throughly cracked up but because I really had no other option but to have him, I had to bear him. Even after a lot of persuasion he didn't speak up. I said,
"Come on, speak your dialog; don't you want your mama to be happy with you?" He replied calmly.
" But if I didn't speak my dialog, my mama would still be happy with me."

Much as this intelligent reply has made me laugh, I am throughly desperate and running out of my patience. I have to have a new angel and there is simply no one to do this role.....