English isn't Latin!—(even though it has adopted the abbreviation of a Latin phrase in this case)
Just use "i.e."—no one would have an idea what "e.s." means.
OT: Your use of "respectice" [sic—"respective"] is not at all idiomatic here. You could simply say "for the three groups (i.e., ..." or, possible, but not necessary, "for each of the three groups (i.e., ..."." Or, to phrase it more directly, "... you have booked for tours # A1-xxx, B2-yyy, and C3-zzz."