London system...Early e5!!!!

HI! I have recently been trying to learn the London system, and was practicing against my friend, when an early e5 was played (1.d4 Nc6 2. Bf4 e5) and although i ended up winning the game, i wasnt so comfortable with the position. 

I am a new player seeking help, does anyone know any good lines or variations against an early e5?

okay, thanks a lot for the help, but this seems to divert a bit from the london system??? or am i missing something here? Soryy for all the questions, but i just like having everything in order!

Btw. you get the same line against 1...e5:

It makes no sense to stick on a standard london system development scheme aginst everything. Sometimes like here it is much better to deviate from that "standard". 

And there is practically no alternative to dxe5, because the bishop is attacked once and the d4-pawn is attacked twice.

With 2. Nf3 e5 3. c3 you could "archive" some position which could get something like a standard london, but black has allready equalized instead of having a bad postion in the line FishEyedFools gave you. And anyway, what to do against a 1...e5 move order?  

thanks for the advice, this will help out a lot!

If anyone has more to add to the thread, please do, but i feel rather covered for next time i see this line, thank you.

Bah, this 2...e5? is just a bad gambit and 3. dxe5 is better than 4. Bxe5.

Thanks. Liked this approach

I wanted to know when it happens like 1. d4 2. Nc6 3. Bf4 and then 4. e5