Copy and edit these professional hotel booking confirmation email templates. Simple, advanced, or Airbnb-styled?" Then, clearly list the most important information about the booking. Booking confirmation emails should list any extras breakfast, dinner, parking, late checkout that they may have added to their reservation. The best subject lines are short, under 60 characters. In order for guests to be reassured that you have their details correct, you need to include those details in the email. Hotel Booking Confirmation Letter Template. The normal check in time is 12 noon, and check out time 2pm. The easiest way to ensure guests are opening your confirmation email is to clearly state what the email is about in the subject line. We don't need to explain what a hotel booking confirmation email is.