Can the New York City city ticket office for Avianca handle cancellation/rebooking of LifeMiles tickets?
I have a BKK-NYC-BKK trip in April on two one-way LifeMiles award tickets, and might want to extend my stay in the USA. So, I'm wondering if I can just pay a visit in person to the ticket office and handle it rather than deal with phone calls, PINs, etc.