By accessing the reservation page it is common that on the left side of the page you have the [Communication with Guest] section and a list of situations where you can trigger emails manually, like the example below:

Recently Airbnb suspended the service for exchanging emails between hosts and guests, since the channel's chat already exists, so on the [Communication with Guest] section will already be adapted to this model, like the example below:

By clicking on the [Go to Chat] button you will be redirected to the [Messages Central] chat and will be able to communicate with the Airbnb guest from your

Be sure to check the link below for more details about the [Messages Central] tool: