You can edit the default texts of the scheduling page by going to scheduling page > settings > default texts:
When you select one off these texts an example for the text on the booking page appears.
You can use html code to edit the texts as you please. Some of the frequently used html codes are:
<b>...</b> = bold
<i>... </i> = italic
<u>... </u> = underline
<big>... </big> = bigger than normal
<small>... </small> = smaller than normal