How can I better show players that enemies are not friends?

I’m a new GM playing Pathfinder with other newbies.

The problem I’m facing is that the group tries to be friends with almost every humanoid that they meet. It’s not that they dislike combat, it’s just that they sometimes are able to talk their way out of situations.

Obviously if they’re having fun, and it doesn’t destroy the game – then I should let them talk their way out of as much as they like. But it’s become a bit cumbersome and is slowing the game down that I have to create full dialog etc for every single goblin or orc that they come across.

Any advice on how I can help suggest to the players that the encounter is a fight and not a negotiation?