Dude ! Imagine playing a game like that in VR ! I would love it !! You definitely nailed the design and the cozy ambiance part, here is my thoughts :
Maybe too much direct dialogues and not enough cooking ? I think the fact that a random stranger talk straight to you is a bit distracting from the relaxing gameplay. I think it would be beneficial to also have random characters arriving at the table and talking with each others (voice acted would be best), and sometimes they would also interact with you but not all the time. Your actions (serving them something) could trigger an interaction with you. I think this would mitigate the kind of "social pressure of talking", it would be a lot more relaxing (at least for me) to just be there in the background, ready to help passengers with their needs without being the center of attention.
Great job tho, I hope you continue this project !