How to pick a specific user to start a 1v1 game. Dynamic AppID or lobby or other?

Options
Background :
- My application has 2 types of user, Type1 and Type2. Although I do not think it matters much.

Goal :
- Once a Type1 user connects to the server
- The Type1 user should be able to see what other Type2 users are available.
- Then Type1 user can pick one Type2 user, and start a game (1v1)

Question :
- How should I approach this?

My ideas :
- Using different AppIDs for each user from the Photon dashboard and changing them in runtime in PhotonServerSettings. Is it possible to implement this idea? My project might need to go this way.
- Using Lobby and Room concept