It's nice to send postcards.
Jason is traveling and his mother asked him to get in touch sometimes to tell her how he's doing.
Jason wants to go back to his hotel.
Jason gets a postcard on his way to his hotel and writes his mother on it about what he's been doing then has the concierge send it.
Jason forgets to contact his mother and goes back to hotel room.
Jason's mother is happy to hear about his time traveling and is relieved that he's okay.
Jason's mother worries that something may have happened to him as she hasn't heard from him at all.