When traveling, it is very easy to forget where you are when discussing business with colleagues. That airport, taxi, restaurant or hotel lobby may have individuals nearby eavesdropping on your conversation. When discussing confidential information, agree to hold off on the conversation until you can be assured of privacy. Also, be careful not to share sensitive information with strangers you meet.
To learn more, check out this OUCH! newsletter: https://securingthehuman.sans.org/newsletters/ouch/issues/OUCH-201702_en.pdf
More cybersecurity education available here: https://prezi.com/zkrdursavbgu/