You are given a sentence from a conversation between a human and a virtual assistant. Your task is to identify which one of following five services the sentence is related to - Media, Travel, Flights, Buses, RideSharing

Find me round economy round trip flights to Portland, OR.
Flights

Hello! I'm looking for 4 tickets in a round-trip flight. please can you help me to reserve the ticket?
Flights

I need to reserve a bus heading to SD.

Buses

