Using Java Programming Language, develop a program for WEGO application as follows:

Assume that you are a member in a development team and you are assigned to enhance the functionality of wego the WEGO application for booking various travel services.

Modify the attached code to can implement the following:

Searching for the cheapest flights based on user preferences such as departure city, destination, travel dates, and preferred airlines

Booking of hotels according to user requirements such as location, check$-$in$/$check$-$out dates, and budget.

Deleting a booking; After the validity time of client's Booking, automatically removed from the booking list.

Traverse all booking details.

$($please make the code cope able and pls solve it within $45$ mins$)$