Just an FYI, I have seen this too much throughout the season. The reason to send messages to set up games by using HF pm is that you both know when the other player will be around and you can look for them during those times.
Your message should state:
Monday I am available around:
Tuesday :
Wednesday:
State your availability for the 3 days. If you don't know for whatever reason, just state that you aren't sure for that day. Generally we all have a time where we are available. Sometimes stuff comes up and your plans change, but at least get a general availability. I don't see enough people responding to me with their availability. They only respond "are you on now" or just give a single period where the game may work. Give your 3 day availability and look for each other during those times. So for next season I am going to change the rule where you must state your 3 day availability, not just simply 'respond' to the message and the game doesn't even get played.