Anakin was no fool, so he knew that Obi won recognized him but he was just waiting for the right time to speak up.
"So you came from Coruscant?" asked Anakin trying to make small talk
"Yes, I have been a member of the rebellion for ten years." Said Obi won trying painfully not to call him out
"Oh have you…master?" said Anakin trying to bait Obi won
"Hello Anakin. Now last time I checked you were never a devout member of the rebellion, actually if I recall correctly your allegiance is to the republic."
"No you're wrong I have changed, I left the sith years ago."
Obi won realized there was no point in arguing because he knew the truth. The only reason he was there was to find out why he needed Anakin so he could save Padme and this he she spoke of.
"Why are you here, you have no business on Tatooine!?" said Anakin who suddenly became angry with Obi won's inappropriate sarcasm
"I told you I am a member of the rebellion."
"You lie Obi won, I know you"
"Do you? You are lying to yourself Anakin; the only thing you know now is darkness."
"Don't lecture me! I see through your lies, just tell me why you are here!"
"I am here because I have a mission only you can help me with."
"I am no fool!"
"No you aren't and that's why you are smart enough to know that I would never approach someone who betrayed me and the people he loved, unless it was something I needed more than anything."
"Well here's your chance to clear the air, what do you need?"
"I need your help."
"Don't be modest Obi won it's the one thing you were never good at! What do you need my help with?"
"Well it's more of a whom."
"Ok, well who I it you need my help with?"
"Padme."