I recently had an English test where we had to read a passage and answer questions about the meaning. I completely failed to understand certain portions of this passage and do not understand the meaning.
Here is the passage. The passage is hypothetical, and is not taken from a real world source or company, but was written by the test makers to demonstrate our understanding of it. (I bolded the parts I had particular difficulty with)
An offer from Cozy_travel.com agency is as follows.
Make a confirmed booking for any service (fight ticket, hotel or rail tickets) through Cozy_travel.com from December 5, 2020 to February 8, 2021 and become eligible for two free air tickets (offer is limited to the base fare).
Free tickets have to be booked through online request from January 1, 2020 to February 28, 2021. The request for free tickets should be submitted at least twenty-one days in advance. Free tickets are non-amendable (except the passenger name) and cannot be cancelled. Free tickets cannot be exchanged for cash or kind with anybody. Cozy_travel will try its best to secure the free ticket as per the request. However, ticket confirmation is subject to airline schedule and set availability in airlines selected and finalized by Cozy_travel from specific available airlines.
Here are the points about this passage that I do not understand:
Does this passage say that the two tickets are absolutely free, or is there only a certain amount called the "base charge" that is free?
Do you have to redeem the tickets between January 1, 2020 and Feb 28, 2021?
The test asked me to describe the "21 days clause" in the passage, but I don't understand what this means.
Does the last bolded sentence mean that when using the free tickets, the airlines used and the seats assigned would be decided by Cozy-travel itself?