in that day. See John 14:20. The use of this important Hebraism (Isaiah 2:11; Isaiah 2:12 and note there) in connexion with the woman of John 16:21 shows that it refers to Israel and has nothing to do with the Church. The promise as to "asking in My name" was fulfilled as long as the offer of restoration on condition of national repentance continued; when that offer was withdrawn (Acts 28:28), the promises (and "gifts") were 'with-drawn also. They will be renewed "in that day".
in. Greek. en. App-104.
nothing. A double negative. Greek. ouk ouden.
ask. Greek. aiteo. App-134.
in My name. See on John 14:13. The texts connect "in My name" with "give" instead of' "ask".