Answer:
A. [Text] hey!!! I cant join class. Could you tell the teacher?
B. [Text] (Seen)
A. (Continues to talk)[Unbothered by the text]
B. [Text] Did you tell them?
B. [Calls] (No Answer)
B. [Calls (Again)] (Pick-Up) Hello! Did you tell the teacher?
A. [Calls] Yeah
B. [Calls] What a relief. Thank you
[They never did cause they were actually on the phone with another friend]