When you create a message, the second step you’ll need to take is to decide which website visitors should see it. This is called Targeting, and is accessed through the Audience tab on the Message Builder. You can target by:
Length of stay
Booking date (use this to create advanced and last minute offer messages)
URL (the webpage they’re currently looking at)
Country (the location they're visiting your website from)
New vs returning
You can also target by a guest's likelihood to book through the Smart targeting option, however this cannot be done in conjunction with other Custom targeting settings.
So, if you wanted to target visitors based on their booking information you’d probably be looking at hotel, check-in date and length of stay.
If you have a play around with the Message Builder, you’ll see that you can add multiple targeting conditions to your messages, and choose a combination of any of these conditions to select exactly which audience type will see your message.
So if you wanted to target a message to customers who are booking three or more nights in a specific hotel and checking in during a particular date range, you'd need to select your hotel from the dropdown menu at the top of the page, then click the Targeting tab to add Length of stay and Check-in date conditions. You can see how this works in the video below.
To be honest, the best way to get properly familiar with all the various ways you could segment and target your customers by booking information (or anything else!) is to log in and start creating some messages. And if you get stuck, firstname.lastname@example.org is always here to help you.