A - It's me
B - it's my classmate
A: hi, what are you complaining about?
B: hi. i have problems with back.
A: Oh... Perhaps it's due to the fact that you do not keep your posture.
B: I know... And how to treat it?
A: Try to exercise more and not sit for hours at the computer.
B: Thank
A: Don't mention it.
A - It's me
B - it's my classmate
A: hi, what are you complaining about?
B: hi. i have problems with back.
A: Oh... Perhaps it's due to the fact that you do not keep your posture.
B: I know... And how to treat it?
A: Try to exercise more and not sit for hours at the computer.
B: Thank
A: Don't mention it.