Which word from the conversation best the reader understand the mood of the scene?

Romeo uses sarcasm in his joke made in the first line, therefore, the words that most characterizes the dialogue is 'jest'. 'Jest' could be interpreted as a joke that actually bothers the person receiving the comment.  The entire dialogue revolves around the first line that was a 'jest', hence, that is the keyword that describes the mood in the dialogue since is used to define Romeo's sarcastic joke.

what novel are you talking about?

they both lost a woman they loved named lenore

they believed they interracted with a talking raven

they became orphaned at a young age.