After the Sierra tour cancelled two dates that they booked with us a third was arranged, when arrived for the tour the Guide didn't turn up, after 3 phone calls ( they went to answer machine) and after waiting and hour and asking various people we had to give up and go home, we were 2 ladies on our own and felt very vulnerable. I received a text the following day saying that the Guide was there, my reply was why didn't they call me as they had my mobile number. and he supposedly was there at 7pm and we were there at 6.45pm