Asking your teacher or google would be the preferred option.

It seems to be a school or college assignment. Before deleopment of the project you need to gather all the requirments ,next step is database design and final step is coding.

i want to know what modules should be included in this project

First design a database to store all the necessary information about the booking like seat number etc. Then you write the program that will plug this data into the database in a user friendly way. You might want to look at some train or airline websites to what you need to store and how they basicly work.

What do u mean by module?