If you would like to change some texts from English to English (translating to another language is described here) you can do it by using the SayWhat? plugin that allows you to alter strings on your site without editing the core code.
Step 1. Install & activate the SayWhat? plugin.
Step 2. Navigate Tools → Text Changes
Step 3. Click “Add New“
Step 4. In the “Original string” field write the original text (Case-sensitive), then in the “Text domain” field write eagle-booking and in the “Replacement string” field add the new text.