How would i reply to this email; Hello (name here) , it was SO good to talk to you on my birthday, thank you very much for calling!
Also, thank you for your email address which is now safely tucked away in my 'contacts', I think mine will be at the top of this message but if not :(email adress)
Can't believe you break up on Thursday, your first English Christmas for a while...hope it's a good one and maybe some snow??!!
Take care and hopefully see you in the not too distant future when this carona virus nightmare is over.
Have fun, lots and lots of love from Grandma XXX

first of all if this is a real email please don't put this on but if this was just like a test here is how to respond

hello I have missed you too you're welcome for calling it was my pleasure and I had a lot of fun talking to you it's good that you saved my email so we can talk more often yeah I know what happened on Thursday was kind of a blur LOL I am excited for my first English Christmas hopefully some snow if you like snow but say no I don't want to know if you don't like snow take care as well yes I hope this coronavirus is over so maybe we can hang out once in awhile

(your name)  XXX

yeah it is i have the dark knight