Error in datatype (nvarchar instead of ntext)

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SQL

SQL-Server

SQL-Server-2008

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I am importing data from excel(.xls) to SQL Server 2008 using SSIS. I have included IMEX=1 in the connection string of excel connection manager. But a column consists of a value as below:

4-Hour Engineer Dispatch ASPP Engr Dispatch 1: Up to 1 dispatch (8 hours) per year.  Hours exceeding allocation billed @ 1.5x hourly rate w/ 8-hr min Engr Dispatch:  8-hrs to arrive on-site from Ciena's determination of need  On-Site Engineer Dispatch - 8 Hour ASPP Engr Dispatch 8: Up to 8 dispatch (64 hours) per year.  Hours exceeding allocation billed @ 1.5x hourly rate w/ 8-hr min Engr Dispatch:  NBD to dispatch from Ciena's determination of need Per Incident On Site Support ASPP Engr Dispatch 12: Up to 12 dispatch (96 hours) per year.  Hours exceeding allocation billed @ 1.5x hourly rate w/ 8-hr min Engr Dispatch:  Next day to arrive on-site from Ciena's determination of need  Resident Engineer Engr Dispatch:  2-hrs to arrive on-site from Ciena's determination of need Engr Dispatch:  4-hrs to arrive on-site from Ciena's determination of need ASPP Engr Dispatch 2: Up to 2 dispatch (16 hours) per year.  Hours exceeding allocation billed @ 1.5x hourly rate w/ 8-hr min N

Actually there are about 600 rows in that Excel file. But the above mentioned value is present after 450 rows only. So, the datatype of that column is taken as nvarchar(255) as default instead of ntext and so I am getting error.

Anybody please help out... Thanks in advance...