The speaker of the line mentioned above is the narrator.
When the girl who was travelling with the narrator in the same compartment asked the narrator about his destination, the narrator replied that he was going to Musoorie. The girl then expressed her desire to visit mussoorie. This market the beginning of a conversation between the narrator and the girl regarding the beauty of the hills and the narrator remarket that October is the best time to visit the hills.
October is the best time to visit the hills because by that time the hills are covered with wild dahlias, the sunshine is pleasant and at night one can sit in front of a log fire and drink a little brandy. The roads also become quit and deserted as the tourist season gets over.