["My oldest friends live in San Francisco and I haven't had a chance to visit in four years.", "I am sorry to hear that, you must miss them. Why haven't you been able to visit them?", "Money, I just finished grad school last year and found a full time job.  Now I have a bit of vacation and I'm very excited to start planning the trip!"]
I see, that is very understandable, I am really glad that you will be able to see them soon! I hope you have a safe trip and a great time! :)
I'm planning a trip to San Francisco to visit friends next year.  I'm very excited, I haven't had a chance to see my friends in 4 years.