When leaving people we can use an expression like Good morning/Good afternoon/Good evening/Good night. Note that Good night is not used to greet people when you meet them. Its meaning is similar to Good bye.
In a less formal style, we can also say:
See you later./ See you tomorrow. / See you next week. / See you soon.
Amar: Hi Sahil, how’re you?
Sahil: I’m fine, thanks. And you?
Amar: I’m okay.
Sahil: Hot day, isn’t it! Can’t believe that it’s a November morning.
Amar: Yeah, the nights are even hotter.
Sahil: Well, I think that’s my train. See you later.
Amar: OK. Bye.
Sahil: Bye, take care.
Ram: Hi Krishna, how’re you doing?
Krishna: Fine, thank you. And you?
Ram: Oh, I’m alright.
Krishna: What terrible weather! It hasn’t stopped raining for days.
Ram: Yes, awful. If it continues to rain like this, we’ll have to swim to work.
Krishna: You’re right. Well, I must be going. See you later.
Ram: Bye. Take care.
Shyam: Hello Raju. Good morning.
Raju: Good morning Shyam. How’re you doing?
Shyam: I’m fine, thanks. How about you?
Raju: I’m good. What about your studies?
Shyam: I’ve just sat for my exams. I’m waiting for the results.
Raju: Oh. I see. OK. I think that’s my bus. See you later.
Shyam: OK. Bye. Take care.
To sit for an exam is to take an exam.
Vikram: Hi Karan. How’re you? Haven’t seen you in a long time?
Karan: I’m okay. I was busy looking for a job. What about you?
Vikram: I’m fine, thanks. What about your job search? Have you found any job yet?
Karan: No luck, so far. I’m still searching.
Vikram: Don’t lose heart. You’ll get a good job soon.
Karan: I hope so.