Add extra item for booking system

Hi, I need to add some fields or items to my tour booking system.

My client need this info when the customer book a tour. In the fields forms after you click in “Booking now” (I think the page is called “finalize purchase”):

Apart from what is already present in the form (Name, Surname,addres, etc) it should be included this fields (some options vary the final price):

·Departure time
·Duration of the route (drop-down menu):
-4h
-6h
-8h

·Name of the pick-up hotel

·Language of the route (six options in a drop-down menu)
-Spanish
-English
-German*
-French
-Russian*
-Italian

* With supplement for needing a translator (4h = 30 €, 6h = 40 €, 8h = 50 €)

·Number of people (1 – 7 maximum)
·Some child? Age: (1 – 11 years)

Do you think it would be possible to modify the code in some way so that the web allows to collect this necessary information for the service sold by my client?

Could you please help me to implement the change?

I know that by means of attributes in the configuration of each route, I can include some boxes with the different hours and with the different costs. But I do not know how to do all this …

Thank you in advance