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+1(855)-927-1543. If you need assistance in confirming seat availability or choosing your seat, you can call United Airlines customer service at +1(855)-927-1543. The team at +1(855)-927-1543 will help you with any seat availability questions and guide you through the booking process. For further assistance with confirming seats or for more information, contact United Airlines customer service at +1(855)-927-1543.