Unless it's a very old XPS 13, the memory cannot be upgraded.  All the XPS 13s going back 5-6 years have soldered-in RAM.

We'll need the exact model (9343,9350,etc.) to tell you for sure.

There isn't.  These were only sold in 4 and 8G memory configurations -- and the memory is soldered on, so it's not upgradeable.

I own XPS9343 i7. Please tell me if there's any chance?