1.   I need to make arrangements with the travel agents as soon as possible, so please let me know whether you will be joining us.

2.   And if you figure out what it is, please let me know.

3.   If not, just let him know you enjoyed your time together.

4.   Just to let people know that I would have passed it if I needed to.

5.   Please let me know if he is available and the price for one date, as well as for a series of dates. . . .

6.   Please let me know and I will begin the search process.

7.   To let him know that, she crinkled her nose, crossed her eyes and stuck out her tongue until he laughed.