You cannot tell whether the friend is a male or female from the conversation you listed. The English translation uses "he" but that is an arbitrary choice. There is no indication of the gender in the Korean version. Korean sentences can have the subject omitted or might use pronouns like 걔 which doesn't specify the gender, so you may not always know whether it's a he or she. As the conversation continues, some information will probably surface which shows the person's gender, or the listener might ask if they want to know it sooner.