I found solution, its working for me. when you are doing lookup use DE filed which is Mobilenumber field.
%%[
SET @idSubscriber = MOBILE_NUMBER
SET @rows = LookupOrderedRows("SMS_Journey_2_interest", 1, "MeetingDate Asc", "MobilePhone",@idSubscriber)
SET @RowCount = RowCount(@rows)
IF (Rowcount(@rows) > 0) THEN
VAR @ILRow, @name, @meetingtype
SET @ILRow = row(@rows,1)
SET @meetingDate = field(@ILRow,"MeetingDate")
ENDIF
]%%
%%[ if @meetingdate > Now() then ]%%
Hi %%=Field(@ILRow,"FirstName")=%%, we want to remind you about the upcoming
info meeting that you have with us next %%=Format(@meetingdate,"MM/dd/yyyy")=%%
at %%=Field(@ILRow,"MeetingPlaceAddress")=%% starting at %%=Field(@ILRow,"TimeFrom")=%%.
If you can't make it please send us a What's up at:
%%[ ENDIF ]%%
