その日ひで全然ぜんぜん差さし支つかえないよ。

sono hi de zenzen sashitsukaenai yo.

That day is totally fine with me, no problem at all. casual

お差さし支つかえなければ、お名前なまえを伺うかがってもよろしいでしょうか。

o sashitsukaenakereba, o namae o ukagatte mo yoroshii deshou ka.

If it's not too much trouble, may I ask your name? formal