' I am not sure if I bought ticket through travel agent or online site' , _ you made me laugh !

First find out where you bought the ticket from.
If you have bought from a travel agent and if the transit time is 17 hrs the airline is obliged to give you hotel accomodation. Last year I travelled on Qatar and I had the same transit time. I called my travel agent and insisted on getting me lodging facility. They eventually gave me an option to choose hotel accomodation or earlier departure from Doha (meaning only 7 hrs of transit time). I chose earlier departure because that meant I could reach Kathmandu at 8.00 am instead of 4 pm ! You can easily spend 7 hrs of transit time by browsing the duty free shop, surfing the websites (available free inside the terminal) or simply napping in the seating facility provided there.