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Should you have any questions or require any assistance from Thai Airways International, the contact details are as follows: Customer Service Phone Number: +66 2 359 0100 Reservations Phone Number: +66 2 628 2000 Office Address: 89 Vibhavadi-Rangsit Rd, Chatuchak, Bangkok 10900 Thailand Hours of operation: 8:30 am -4:30 pm With regards to the above during their operational hours, do not hesitate to contact them for more clarity booking, flying, or any other related questions.