No problem I will let you know Delhi Tourism And Transport Development Corporation booking counters addresses, so that you can check it easily.

Here are the booking counters

Tourist Information cum Booking office in Delhi :
Central Reservation Office, Coffee Home-1, Baba Kharak Singh Marg,
New Delhi-110001,
Ph: 23365358, 23363607, Fax: 23367322

I-Center, Baba Kharak Singh Marg, New Delhi-110001
New Delhi Railway Station (PaharGanj side, Near Exit Gate no. 1)
Ph: 011-23741871
Dilli Haat - INA
Ph: 011-65390009

Domestic Airport- T-1 (Arrival)
PH: 011-25675609

Tourist Information cum Booking office outside Delhi:
Kolkata
Mrs. Joy Shree Sinha Roy
Ballygunge, new AC market, 46/31/1, Gariahat Road
Kolkatta-700029
Mobile: 08334973844, 09804417782

Chennai
Mr. Radhakrishnan
C/O Delhi Tourism
Tamilnadu tourism Complex,
Wallajan Road,
Chennai-600002
Mobile: 09283497985

Address:-
Delhi Tourism And Transport Development Corporation
18-A, D.D.A.SCO Complex,
Defence Colony,
New Delhi - 24,

Phone:-
91-11-24647005, 24698431, 24618026