Yes, if you booked your group flight with Delta Airlines and further you want to modify your booking. In that case, Delta Airlines allows its passengers to make changes like name, dates, flight, or number of passengers as many times as they want. However, travelers can make an adjustment to Delta Airline group travel reservations before the flight's scheduled departure time only. For more details about its guidelines, booking steps, and benefits visit Delta Airlines official website or check out the blog at the mentioned link.