Book of Common Prayer (page 114)

A bishop or priest may use the following or some other blessing or
grace

The Lord bless you and keep you. Amen.

The Lord make his face to shine upon you and be gracious to you.
Amen.

The Lord lift up his countenance upon you and give you peace. Amen.

A deacon or lay person using the preceding blessing substitutes "us"
for "you."

A dismissal may be used (adding "Alleluia, alleluia" in Easter Season)

The People respond

Thanks be to God.

In Easter Season the People respond

Thanks be to God. Alleluia, alleluia.