In my life, I have some friends but they are true friends.
This sentence sounds a little odd. Let me help you.
I have few friends in my life, but they are true friends.When we were being on train, we met old couple who can speak Thai, we had the same direction, so they came with us.
We met an old couple while travelling on the train. They could speak Thai and since they were going to the same place as us, they decided to join us.We decided to separate for 2 groups, one group went down the stairs and another waited for an elevator with old couple but we misunderstood that the exit from an elevator and stairs were the same, so we lost each other and hadn't mobile phone or internet.
... This sentence is too long. Try to break it down.
We decided to go in 2 separate groups. One group took the stairs and the other group waited for the elevator with the old couple.I dont quite understand the next bit. If the exits of the elevator and the stairs were the same how did you get lost???