Is it permissible to say, "I wish to have it in Paradise, God willing," to someone who asks, "Why do you not wish to travel?" or "Why do you not long to acquire a certain thing?"

There is no impediment to a person saying, "I want to obtain such-and-such in Paradise," as long as it does not contradict Allah's promise to the believers in Paradise, such as desiring to transfer a disbeliever from Hellfire to Paradise.