I used their US service. When I called 18667217639 it went to voicemail immediately which said they were closed and to call back during business hours. This was well before the 24 hr window so I thought I would wait and call back the next day. The next day, during business hours as listed on their webpage, I got the same message. I wasn’t able to fly because of a last minute passport visa issue and I couldn’t reach anyone. I went through their UK number to reach a US person. That person said they could not do anything as we were within the 24 hr window to reschedule. I told them about their phone line and he simply said they might have had a high call volume. High call volume? Excuse me? That’s why you won’t help me? Do yourself a favor and book with literally any other agency. Maybe someone else will accept responsibility for not providing their service.