human
Existing Text : 
The schedule is : 
9:00 AM - 10:00 AM : Meeting 
10:00 AM - 11:00 AM : Break

User Input:
Add a meeting with John from 11:00 AM to 12:00 PM
gpt
The schedule is : 
9:00 AM - 10:00 AM : Meeting 
10:00 AM - 11:00 AM : Break 
11:00 AM - 12:00 PM : Meeting with John