Answer and Explanation:
Dear Chris,
I would love to come to the party! Thanks for inviting me! I'm sure it is going to be a lot of fun.
You mentioned you are a bit overwhelmed with arranging everything. I would love to help you! I can be in charge of the cake and decoration, if that's okay with you. If there is anything else you would like for me to do, just let me know!
I would also like to buy Ms. Geller a gift. I thought of a couple of things, such as one of those fancy pens or even a beautiful scarf I saw the other day, but I'm afraid that type of gift may seem too impersonal. Could you give me some ideas for a present?
I'll be waiting for your reply!
Yours,
. . .