SQL Server 2014 :: Error In Adding Condition In Query

Following is a working code

declare @dte as datetime='2015-04-01'
declare @StDt as Datetime = DATEADD(mm,DATEDIFF(mm,0,@dte), 0)
declare @EnDt as datetime = DATEADD( DD, -1, DATEADD(mm,DATEDIFF(mm,0,@dte) + 1, 0));
DECLARE @query AS NVARCHAR(MAX);
create table #bus_master(bus_id int,bus_name varchar(50),uname varchar(50))
insert into #bus_master values(100,'A','lekshmi')

[Code] ...

I am getting the output correctly. My requirement is i want to write a condition here
JOIN busdetails b ON m.bus_id = b.bus_id

I want to write this statement as
JOIN busdetails b ON m.bus_id = b.bus_id and m.uname='lekshmi'

When I tried this code I am getting error.