Hey @Christina591 as a first time host I can see how this would make you nervous- it is always concerning when guests don't communicate well, and could be for any number of reasons.
Often the main one is that the guest hasn't enabled notifcations on their Airbnb app if they have it installed on their phone, and they haven't logged into their desktop to check messages either.
You could do 2 things to get the issue resolved:
1) pull your guests mobile phone number from their itinerary, and drop them a message or phonecall directly- this usually works for me
2) if this doesn't work, or as an added precaution- call Airbnb support and explain the situation and ask them to contact the guest for you, and if you/Airbnb can't reach the guest then you can ask Airbnb to cancel the reservation on your behalf (never do this yourself)
Though not useful for this booking, you can adjust your settings to only allow guests with previous reviews to book to give you a sense of peace of mind, especially when you're new to hosting and building your confidence.
Best wishes
Paul 🙂