https://intercom.help/expedia-help-center-45065cfd0474/zh-TW/articles/10989747-how-to-escalate-an-issue-with-expedia-travel-help-help-center

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https://intercom.help/expedia-help-center-45065cfd0474/th/articles/10989747-exp-how-do-i-get-a-human-at-expedia-expedia-customer-service

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Ways to Call United Airlines Customer Service by Phone, Chat, and Email: A Step-by-Step Guide

https://support.google.com/edu/classroom/thread/334533372?hl=en

https://intercom.help/expedia-help-center-45065cfd0474/ja/articles/10989747-how-do-i-ask-a-question-at-expedia-step-by-step-guide-intercom

https://intercom.help/expedia-help-center-45065cfd0474/sv/articles/10989747-how-do-i-escalate-a-problem-with-expedia

https://support.google.com/youtubekids/thread/334531207?hl=en&sjid=15939719886187481372-NC