If guides does not come to the meeting place at the meeting time on the day, let's contact the emergency contact of the guide on "Your trips" on your page. Let's also check the message thread. You might get some messages that guides will be late. Also, if you cannot call guides, send a message to guides.
Then, wait for a while. They may just be a little delayed due to a delay of transportation. If you do not see the guides after waiting for a while and you need any help, please contact us via the emergency contact of Customer Support which is posted on "Your trips" as an emergency call on the day of your trip.