Write your select query using case:
select *,dist as 'Distance',Veh_no as 'taxi_no',case when reply=0 then 'No' when reply=1 then 'Yes' else 'No Response' end as Reply
Then Bind 'Reply' field in your gridview like this:
<asp:boundfield datafield="Reply" headertext="Status" mode="hold" xmlns:asp="#unknown" /> <HeaderStyle Wrap="False" Font-Names="Arial" Font-Size="8pt" HorizontalAlign="Center" VerticalAlign="Middle" />
<ItemStyle HorizontalAlign="Center" Width="25px" VerticalAlign="Middle" />
</asp:BoundField>