From Longman Dictionary of Contemporary Englishbooking officeˈbooking ˌoffice noun [countable] British EnglishTT a place where you can buy train or bus tickets SYN ticket office → box office
Examples from the Corpus
booking office• The parcel office and booking office will be available for photography aided by staff in period dress.• The first objective is the provision of a new souvenir shop, refreshment room and booking office.• The driver had not seen anyone on the platform and neither had the booking office clerk.• At the station I pointed out the booking office.• Contact your local London Underground booking office for details. 