It is very likely that someone would want to attend their father's birthday party and be happy about being able to make it, so someone saying that they are overjoyed that they will not be able to go is actually being sarcastic.
Context: I am worried I will not be able to go to my fathers birthday party.
Hypothesis: I am overjoyed that I will not be able to make it to my fathers birthday party

Given this context, is the hypothesis true (Yes/No/I don't know)?