John: I am so angry, Al.
Al: ???
John: My supervisor postponed the meeting again.
Al: Gosh, he's really crap.
John: I know, I'm thinking about changing him.
Al: Do it.
John:  You know it's not that easy.
Al: Why not?
John: The whole procedure is complicated and I would have to give a reason.
Al: Like "he is crap"?
John: You cannot say it openly at the department
Al: That could actually create only more problems.
John: Exactly.
Al: it would be good if he resined himself.
John: But should I suggest it to him?
Al: Maybe you could. 
John: He actually seems a nice person, he's just a horrible supervisor.
Al: yeah, a nightmare of every student.
John: I will try to talk to him next time.
Al: Good luck with it!
John: Keep your fingers crossed.
John's supervisor postponed the meeting again, which made him angry. He wants to change his supervisor, but it's not easy. He will talk to him, maybe he will agree to resign.