" 1.888.242.2100, Monday to Friday, 8am to 4pm local time, except for statutory holidays. To speak to an agent, you can sometimes navigate through the automated messages by pressing 1-1-1-2-0"
Getting the Passport before May 27 is possible and at the same time not possible, dont really take a chance if the trip is very important. If you are from a visa exempt country then you should be fine.