I woke up yesterday and could not find my cell phone.
Where did you think you lost it?
I think I left it in a taxi.
You should find a phone and call the taxi service to see if anyone turned the phone in. Maybe it would help to keep track of your possessions to put a tracker on them.
I'll get right on that.
That's a good idea. It will help you to keep track of your important belongings, especially when out in public.