Or, if you're meeting a friend and going out for dinner but you haven't made a reservation yet,

又或者，你准备见一个朋友，并一起出去吃饭，但是你还没有预约餐厅，

Where 课堂 - SpeakingMax英语口语达人

when you go to a bar and you meet a friend there,

当你去酒吧见一个朋友，

It seems 课堂 - SpeakingMax英语口语达人

I'm just visiting London. I came to meet a friend.

我只是来伦敦旅游。我来见一个朋友。

来伦敦旅游的 - SpeakingMax英语口语达人