My guests didn't take heed of the pre-booking message asking to give an arrival time upon booking. They then didn't respond to my booking confirmation message, asking them to give an arrival time when they can. Three days before arrival, they also didn't respond to the message - yet again - asking for an arrival time (in this message, I also sent on the link for the check-in guide).
It's now 3pm on the day of their arrival and I'm waiting around here. I don't want to harass them but it's stressing me out a bit, not knowing when they're arriving and whether they'll be bad guests because of this. They have no previous reviews and no profile picture, but I accepted their request at the time because their initial message was polite.
What can I do? Worst case scenario, if they don't arrive before 11pm, can I lock the front door and tell them that sorry, but they have to check in tomorrow because the check-in time is over?
Advice is appreciated. Thanks!