Do I have to tip a driver?
      No, tips are not necessary in Japan.
   Where can I meet a driver during my stay in hotel?
      Please stay around the lobby. Bell captain or front desk will call on you
   For example, if we make a reservation of 6 hour use,
     but actually we use only 3 hours, is the 6 hours use charged?
      Yes. 6 hours of use is charged.