You will run into Aerith for the first time on your way. She is the one that is selling flowers. When you talk to Aerith, say:
1. Nothing happened
2. That you would like a flower for 1 Gil.
By doing this, you will unlock a special sequence in the bar later. Proceed through the Area 8 city. You will have a choice to confront the guards or not. It is good to fight these guys, because they give pretty good experience that you might need later. You will escape with another CG showing you fleeing the station. You will be informed of Avalanche's involvement on the train. You will jump off of the train and get to Agito. Go to the bar and meet Barrett's daughter and talk to Tifa. Answer "Not this time" and she will complement you on your maturity. You name Tifa now, and you get to decide to give your flower to Tifa or Barrett's daughter. It doesn't matter who you choose. Go to the exit of the bar, and you will enter the HQ under the Pinball machine. You will tell Barrett that you are not interested in Shinra or Avalanche. Barret and Tifa will urge you to be in the Avalanche. Be prepared for a flashback sequence. Cloud made a promise with Tifa long ago. Barret will come in with Cloud's pay. And because of Cloud's promise, Cloud accepts the next mission. Barret will ask about Materia Orbs. Explain to him how they work, buy items in the town, and it's of to Area 5-Mako Industrial Complex.
