Hi Pankaj,
Thanku for your reply.
yes, i am getting the error like " Cannot read property 'getFormContext' of undefined"
so the ask from me is the below one:
Add a custom ribbon button called "Submit" and place it on Travel Plane form after new button.(done)
On Click of the button, the submit field on the form should set to yes.
Add a Jscipt called atci_/Scripts/TravelPlan.OnLoad.js. Write a script to set the Submit field to Yes.
Call that Script on click of submit button.

Regards,
Richa