Will catch up with you?

I met my friend for the third time, who lies and speaks truth on alternate days.

I asked him, "Will you tell the truth today?"

He replied, " Yes, I will."

I asked again, "If I had asked the same question yesterday, you would have replied what??"

He replied, " I would have replied the same."

On the basis of the above conversation, what can be said about my friend.

Can you catch some liars for me. Here are some of them who make statements worth deceiving