CRM 2013: Using Java Script to get multiple records

I have created 2 new entities - "HelpDesk" and "Conversation".

HelpDesk can have multiple Conversations ( 1 to N relationship)

HelpDesk unique identifier field is "ID"

Conversations has 2 attributes  - "modified Date" and "message" . It's referring  attribute to helpdesk is "helpdeskid"

Now, in the form of HelpDesk - there is a  embed web control (html -js) -  where I would like show the all the "message"  of related  Conversation  ordered by "modified date".

So, could some one refer me to some simple java script code through which - I can achieve this?

Thanks,

Hasib

Hasibur Rahman