https://ehs.umich.edu/wp-content/uploads/formidable/48/How-do-I-Talk-to-a-Real-Person-at-Qantas.pdf
https://ehs.umich.edu/wp-content/uploads/formidable/48/Does-Hilton-give-full-refunds.pdf
https://ehs.umich.edu/wp-content/uploads/formidable/48/Can-I-chat-with-Marriott-customer-service.pdf
https://qantascustomersupport.zohodesk.com/portal/en/kb/articles/quick-know-is-qantas-call-centre-open-24-hours
https://ehs.umich.edu/wp-content/uploads/formidable/48/How-do-I-contact-Hilton-reservations-Hilton-Reservations.pdf