Just please don't call yourself "Yummy" and everything will turn out just ok :')

Seriously Alisa, why don't you ask your boss to remember your original name?

If you can pronounce their name, it's fair enough that they try to pronounce 

your name. I trained myself on pronouncing my Korean friend's name, it took

2 minutes :)

You don't need to get an English name, you can just use the Pinyin of your Chinese name (maybe changing the spelling if necessary so people are less likely to mispronounce it). See the discussion here:  https://www.italki.com/discussion/122673

I knew that getting an English name is something a lot of Chinese people do, but what I find interesting is that you don't want an English name starting with the same letter as your boss' name. That's something I've never heard of before. Is that a cultural thing, or do you have another reason for doing so? I know that traditionally Chinese people weren't allowed to have names that shared characters with the reigning emperor at the time - is there any relation between that and the practice (if it is one) of not wanting your English name to start with the same letter as your boss' name?

How about?

Dawn - Breaking of day

or

Diane/Diana - Virgin Goddess

or

Eve/Eva  - Life giving

or

Luna - Shining

or 

Linda - Beautiful

Gwendoline, like Gwendoline Christie. The meaning is "fair". You could shorten it to Gwen if need be.

You could change the one you have now, Alisa, to Ailsa.