Question 1 : 
The purpose of the channel manager is to provide an easy way for hoteliers to host their listings on multiple online travel agents to increase global reach.
A software that automates the tasks from updating rates to managing inventory. You have one interface to manage all of your channels

Users
Hotel management Systems like Taj Hotels Group: Hotel owners and managers who independently run their operations will be direct consumers.
eg : Hotel Anshuman in Mahipalpur Delhi. 

Online Travel Agents : The channel manager will be connected to world wide travel agents like Booking.com, Expedia, Agoda.
.

# USECASES

#  AS HOTEL MANAGEMENT SYSTEMS
* Onboard onto the Channel Manager
* Sync property information
* Sync availability & pricing information
* Consume Bookings 
# AS CHANNEL MANAGER
* Connect to different OTA’s
* Sync Property Data  & Availability & Pricing
* Retrieve Bookings

Could you help me with LLD and HLD ?